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MODIFY dbtab FROM wa - Not Working

Hi Experts!!

CLEAR gs_proj.


gs_proj-aenam = sy-uname.

gs_proj-aedat = sy-datum.

gs_proj-zzdate = date.

MODIFY zrproj FROM gs_proj.

ZRPROJ is copy of PROJ table with an extra primary key as zzdate. Now though I give a unique entry with different zzdate, MODIFY is not working but is giving sy-subrc 4. When I checked, there were secondary indices in ZRPROJ (copied from PROJ) and hence deleted all the secondary indices. But still sy-subrc is 4 only.

Can anybody help me in figuring out what the problem is here?

Your help is highly appreciable.

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