Whenever I find a PO number at a different site I get the error message

Uniqueness of index CRELPONO is violated.

where "CRELPONO" is the index associated with the PO number.

The table is buffered and the index is a "candidate" index because the user needs unique PO numbers

I have tried to fix it unsuccessfully.. How do I fix the problem so that I do not get the error message (number 1884)?