This can be caused by
- a bit field that has no data in one or more records (in tables such as sql server)
- code that doesn't save the current record but attempts to move to a different (or new record) improperly
- code that saves OK but then runs an update and doesn't save that update (or vice versa)
Probably there are other reasons not coming to mind at the moment. Might have to paste your save button code, and maybe form code related to field events.
Edit
- two subforms, one with update not saved & attempting to update the other.
Last edited by Micron; 09-26-2018 at 01:20 PM.
Reason: clarification
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.