Import container contains errors issue for Release Strategy workflow

Hello Experts,

I have copied the standard workflow WS20000075 for PO approval on Release step.

the copied workflow works fine in sandbox system, but in the test system I get an error saying 'import container contains errors (are any obligatory elements missing?)' I guess 'ReleaseCode' is not getting passed to the Workflow from the PO creation T-code.

I went thru few SCN post, did check all the Linkages as said, everything seems to be ok. but still cannot trigger the workflow.

need guidance as to where I may be going wrong.

Regards,

Jibran