After migrating from BPMS 6.4 to RHPAM 7.3.1 some Guided Decision Tables gives the error: "Cannot assign field values of types other than ActionFieldFunction"

Issue

After running the migration tool from JBoss BPMS 6.4 to RHPAM 7.3.1 over the .niogit folder and starting the RHPAM 7.3.1, the following error appears in the log file and the DRLs and GDSTs assets can't be opened from the business central:

2020-11-17 18:01:24,632 ERROR [org.kie.workbench.common.services.backend.builder.core.Builder] (Thread-184) Cannot assign field values of types other than ActionFieldFunction.: java.lang.IllegalArgumentException: Cannot assign field values of types other than ActionFieldFunction.
 at org.drools.workbench.models.datamodel.rule.ActionCallMethod.addFieldValue(ActionCallMethod.java:79)
 at org.drools.workbench.models.guided.dtable.backend.GuidedDTDRLPersistence.doAction(GuidedDTDRLPersistence.java:488)
 at org.drools.workbench.models.guided.dtable.backend.GuidedDTDRLPersistence.doActions(GuidedDTDRLPersistence.java:216)
 at org.drools.workbench.models.guided.dtable.backend.GuidedDTDRLPersistence.marshal(GuidedDTDRLPersistence.java:139)
 at org.drools.workbench.models.guided.dtable.backend.GuidedDecisionTableProviderImpl.loadFromInputStream(GuidedDecisionTableProviderImpl.java:41)
 at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.guidedDecisionTableToPackageDescr(KnowledgeBuilderImpl.java:427)
 at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl$ResourceToPkgDescrMapper.lambda$static$5(CompositeKnowledgeBuilderImpl.java:328)
 at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildResource(CompositeKnowledgeBuilderImpl.java:199)
 at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.buildPackageDescr(CompositeKnowledgeBuilderImpl.java:189)
 at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:108)
 at org.drools.compiler.builder.impl.CompositeKnowledgeBuilderImpl.build(CompositeKnowledgeBuilderImpl.java:100)
 at org.drools.compiler.kie.builder.impl.AbstractKieProject.buildKnowledgePackages(AbstractKieProject.java:260)
 at org.drools.compiler.kie.builder.impl.AbstractKieProject.verify(AbstractKieProject.java:75)
 at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildKieProject(KieBuilderImpl.java:270)
 at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:238)
 at org.drools.compiler.kie.builder.impl.KieBuilderImpl.buildAll(KieBuilderImpl.java:203)
 at org.kie.workbench.common.services.backend.builder.core.Builder.build(Builder.java:213)
 at org.kie.workbench.common.services.backend.builder.core.BuildHelper.build(BuildHelper.java:92)
 at org.kie.workbench.common.services.backend.builder.core.BuildHelper$Proxy$_$$_WeldClientProxy.build(Unknown Source)
 at org.kie.workbench.common.services.backend.builder.ala.LocalBuildExecConfigExecutor.apply(LocalBuildExecConfigExecutor.java:61)
 at org.kie.workbench.common.services.backend.builder.ala.LocalBuildExecConfigExecutor.apply(LocalBuildExecConfigExecutor.java:32)
 at org.kie.workbench.common.services.backend.builder.ala.LocalBuildExecConfigExecutor$Proxy$_$$_WeldClientProxy.apply(Unknown Source)
 at org.guvnor.ala.pipeline.execution.PipelineExecutor.lambda$continuePipeline$0(PipelineExecutor.java:109)
 at org.guvnor.ala.pipeline.StageUtil$1.execute(StageUtil.java:38)
 at org.guvnor.ala.pipeline.StageUtil$1.execute(StageUtil.java:33)
 at org.guvnor.ala.pipeline.execution.PipelineExecutor.continuePipeline(PipelineExecutor.java:94)
 at org.guvnor.ala.pipeline.execution.PipelineExecutor.execute(PipelineExecutor.java:76)
 at org.kie.workbench.common.services.backend.builder.ala.BuildPipelineInvoker.invokeLocalBuildPipeLine(BuildPipelineInvoker.java:88)
 at org.kie.workbench.common.services.backend.builder.ala.BuildPipelineInvoker$Proxy$_$$_WeldClientProxy.invokeLocalBuildPipeLine(Unknown Source)
 at org.kie.workbench.common.services.backend.builder.service.BuildServiceHelper.invokeLocalBuildPipeLine(BuildServiceHelper.java:152)
 at org.kie.workbench.common.services.backend.builder.service.BuildServiceHelper.localBuild(BuildServiceHelper.java:82)
 at org.kie.workbench.common.services.backend.builder.service.BuildServiceHelper$Proxy$_$$_WeldClientProxy.localBuild(Unknown Source)
 at org.kie.workbench.common.services.backend.builder.service.BuildServiceImpl.build(BuildServiceImpl.java:69)
 at org.kie.workbench.common.services.backend.builder.service.BuildServiceImpl$Proxy$_$$_WeldClientProxy.build(Unknown Source)
 at org.kie.workbench.common.services.backend.builder.service.BuildInfoService.getBuildInfo(BuildInfoService.java:59)
 at org.kie.workbench.common.services.backend.builder.service.BuildInfoService$Proxy$_$$_WeldClientProxy.getBuildInfo(Unknown Source)
 at org.kie.workbench.common.services.datamodel.backend.server.cache.LRUModuleDataModelOracleCache.makeModuleOracle(LRUModuleDataModelOracleCache.java:81)
 at org.kie.workbench.common.services.datamodel.backend.server.cache.LRUModuleDataModelOracleCache.assertModuleDataModelOracle(LRUModuleDataModelOracleCache.java:72)
 at org.kie.workbench.common.services.datamodel.backend.server.cache.LRUModuleDataModelOracleCache$Proxy$_$$_WeldClientProxy.assertModuleDataModelOracle(Unknown Source)
 at org.kie.workbench.common.services.datamodel.backend.server.DataModelServiceImpl.getModuleDataModel(DataModelServiceImpl.java:91)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:498)
 at org.jboss.weld.bean.proxy.AbstractBeanInstance.invoke(AbstractBeanInstance.java:38)
 at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:106)
 at org.kie.workbench.common.services.datamodel.backend.server.service.DataModelService$1022366835$Proxy$_$$_WeldClientProxy.getModuleDataModel(Unknown Source)
 at org.drools.workbench.screens.testscenario.backend.server.indexing.TestScenarioFileIndexer.getModuleDataModelOracle(TestScenarioFileIndexer.java:76)
 at org.drools.workbench.screens.testscenario.backend.server.indexing.TestScenarioFileIndexer.fillIndexBuilder(TestScenarioFileIndexer.java:51)
 at org.drools.workbench.screens.testscenario.backend.server.indexing.TestScenarioFileIndexer.fillIndexBuilder(TestScenarioFileIndexer.java:33)
 at org.kie.workbench.common.services.refactoring.backend.server.indexing.AbstractFileIndexer.toKObject(AbstractFileIndexer.java:78)
 at org.drools.workbench.screens.testscenario.backend.server.indexing.TestScenarioFileIndexer$Proxy$_$$_WeldClientProxy.toKObject(Unknown Source)
 at org.uberfire.ext.metadata.io.IndexerDispatcher$IndexerJob.processNew(IndexerDispatcher.java:255)
 at org.uberfire.ext.metadata.io.IndexableIOEvent$NewFileEvent.apply(IndexableIOEvent.java:62)
 at org.uberfire.ext.metadata.io.IndexerDispatcher$IndexerJob.processEvent(IndexerDispatcher.java:235)
 at org.uberfire.ext.metadata.io.IndexerDispatcher$IndexerJob.processEvents(IndexerDispatcher.java:211)
 at org.uberfire.ext.metadata.io.IndexerDispatcher$IndexerJob.get(IndexerDispatcher.java:188)
 at org.uberfire.ext.metadata.io.IndexerDispatcher$IndexerJob.get(IndexerDispatcher.java:159)
 at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)