We have Enterprise 2012 installed but want to upgrade only SW 2013 and stay at Enterprise 2012. Will this be a problem?
No, that is not supported. See the first paragraph under the "System Requirements"
"The combination of a newer version of SolidWorks and an older version of Enterprise PDM is not supported."
Take a look here:
Hope this answers your question,
I agree with Tim,
You always want to keep EPDM newer or equal to Solidworks.
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