Parent will not save for email.

[showard]

Emails are not saving the parent field. A parent can be selected, but when save is attempted, the parent field reverts to blank/empty. Parent fields save in other record types (e.g. tasks, meetings, etc.). But parent field will not save for emails.

Nothing related is showing in the logs - not the espo log or the nginx error or access logs.

Any ideas why the parent field will not save?

[emillod]

Is there any error information on the screen or in browser console?
There may be a hook or formula set for this field which changes after save.

[rabii]

Emails are not saving the parent field. A parent can be selected, but when save is attempted, the parent field reverts to blank/empty. Parent fields save in other record types (e.g. tasks, meetings, etc.). But parent field will not save for emails.

Nothing related is showing in the logs - not the espo log or the nginx error or access logs.

Any ideas why the parent field will not save?

check if you have any formula / hooks set up for the email entity which reset the parent to null.

[showard]

Good ideas. But I can't find anything.
There are no formulas set up on the email entity.
There are no workflows active.
No process flowcharts are active for emails.
The browser console shows a notice - "could not open 'espo' cache" - but other than that I don't see anything relevant.
I'm coming up empty on ideas.