Received error 'Object Y2SYVENG in library QSYS not found' when upgrade utility YAPYMDLCHG

Document ID : KB000074734
Last Modified Date : 23/03/2018
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Issue:
My Model Data area library is Y2SY.   So, I restored Y2SYVENG into Y2SY. I didn't change 
National language as we use default *ENG. 

When I first ran the upgrade utility YAPYMDLCHG it didn't work and gave the following error 
"Object Y2SYVENG in library QSYS not found."   I restored Y2SYVENG into Y2SY, and Y2SY was in the library list hence I shouldn't get this error. 
 
Resolution:
As you have merged Y2SYVENG into Y2SY, then you need to update *DTAARA YLNGENGSYA to Y2SY. This indicates where the English language library is located (needed to update YLNGENGSYA from Y2SYVENG to Y2SY). After that YAPYMDLCHG should work.