Hello to all

I am having a very sporadic problem. I have a table with an autoIncrement primary key named INVTYPEPK. On occasion,
The error:

"Field INVTYPEPK is read only”

The code:

GATHER MEMVAR MEMO && FIELDS EXCEPT invTypePK

We have granted full-rights to the user, but the error still occurs sporadically. It has yet to occur with any other users, but the routine is used rarely by others.

Any ideas??

Thanks in advance