The model 'ApplicationFoundation. Model X' belongs to the package 'ApplicationFoundation' that is blocked from customization. You cannot have more than one model in this package

I'm doing code upgrade from Ax 2012 r3 to D365 7.3 using LCS tool

I got CodeMergeSolution in VSTS project. Where I can find one workflow related changed which i did in workflow class in AX 2012 R3. When I merge and Build the Application Foundation Im receiveing the following error. 

The model 'ApplicationFoundation. Model X' belongs to the package 'ApplicationFoundation' that is blocked from customization. You cannot have more than one model in this package

 

This Model X is comes from ISV

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