Do you have a script trigger on the field? Is "save records automatically" unchecked in the layout setup?
Could there be a script trigger on the field or maybe the Save Records Automatically setting in the layout setup?
Go into Layout mode and select "Layouts" menu at the top. Select "Layout Setup..." from the menu. Is "Save Record Changes Automatically" unchecked?
It sounds like the field might have a Validation setting that is not being met. You would have to check the field settings.
You might also use a script to create the record. Two steps, New Record and Committ
LOL, looks like all three of us suggested the same thing at almost the same time.
I needed to check "Save Records Automatically."
I had looked at the layout setup 3 times and did not 'see' it.... amazing....
Thanks for your help.