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Getting the error - Value "MY.literal.l10" cannot be assigned to attribute "ChangeRequest:my" on creating from the template.
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As far as I know, work item templates depend on and contains project area process specific values. You have to make sure that the project area process you copy the template to supports all the values. If necessary you have to manually adjust the template or you can not copy it across project areas.
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We have replicated the same project area exporting the process template from Test to Prod, so I'm thinking the parameters should be same.
What changes can I make in manually in the project area? I did check the template but could not find the attribute "ChangeRequest:my"
If you looked into the template XML and were not able to find a reference to the literal value or the attribute name, I have to assume that the issue happens when it is run. You could try to execute what the template does manually and see if the error happens too.
You can also check the process source if you can find that literal and the related attribute. It needs to come from somewhere. The template, or either the source process, or the target process, maybe attribute customization.