Concatenating User Datasets in the Definition DDs

Document ID : KB000016230
Last Modified Date : 14/02/2018
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Question:

Can a "user" data set be concatenated above the CA-maintained data set for the SUMMDEFS, JOINDEFS and DELTADEF DDs?

Answer:

Yes they can. The file definition in JCL has higher priority than the parameter value in VKGPARMS member.
The value from VKGPARMS should be used only if the appropriate DD-name is not specified.