Error message trying to delete a line on a purchase order in NAV 2013.

When we try to delete a line on a purchase order, we receive the following message:

An attempt was made to change an old version of a Purchase Line record.  The record should first be reread from the database.  This is a programming error.

Indentification fields and values:

Document type='Order',Document No.='BC00000194', Line No.='10000'