Can't post sales invoice - error in table iv_lot_mstr

Hi,

When I try to post a sales invoice, it gives this error:

Uncontrolled database exception. One operation remove in the table 'iv_lot_mstr' failed because it couldn't block the record.

Then, the sales invoice goes to Batch recovery. In that window, it doesn't post either giving the same error.

The edit list doesn't show any error. I don't understand.

Does anybody know what is the problem?

I'm using GP 10, SP4 ESLA.

Thanks,

JCF