Error while uploading BRMS/BPMS maven repository zip provided by Red Hat to internal nexus repository

Issue

We are trying to stepup new internal nexus maven repository and we tried uploading the contents of maven-repository provided by Red Hat (Red Hat JBoss BPM Suite 6.1.0 Maven Repository) into the nexus maven repository. But it fails with below error while uploading the maven repository into nexus.

Failed to deploy artifacts: Could not transfer artifact sun-jaxb:jaxb-api:jar:2.1.4 from/to thirdparty (http://serverhost:8080/nexus/content/repositories/): Failed to transfer file: http://serverhost:8080/nexus/content/repositories//sun-jaxb/jaxb-api/2.1.4/jaxb-api-2.1.4.jar. Return code is: 400, ReasonPhrase:Bad Request. -> [Help 1]