Indexes 6 and 0 for table ZMM_TEST have identical fields

Hi,

I have created ZMM_TEST table by copying PKPS table.

Table ZMM_TEST is exactly same as that of PKPS table. ZMM_TEST table has no inconsistency and got activated successfully.

My user asked me to change key field from PKKEY (Identification Number ) to PKNUM ( Control cycle number ).

When I changed the key field, during activation its resulting with error "Indexes 6 and 0 for table ZMM_KANBAN_HIST have identical fields"

I have checked the indexes but not able to figure out the root cause for the error.

Please help me to fix.

Thanks & Regards,

Priya