It is very likely that you have created or set some of the VTiger fields mandatory and that is the reason you are getting this popup. Few possible reasons:
First, double check and make sure that the field shows up on your corrensa toolbar in Outlook, Gmail or Office 365 – if it does, it is possible that you just forgot to input the value when editing/creating the record. The solution is simple – input value so the field is not blank and proceed saving the reecord.
If you are trying to save a record in Corrensa toolbar and you getting the message and can’t find the field that is being required, it is most likely you created that field/set it as mandatory after initial sync with corrensa.
The solution is simple – you will need to log back into Corrensa configuration and add the missing field.
The last step is to open Corrensa toolbar and click on gear icon (in the toolbar itself) and click “Update from server”. Once that completes, you can restart your outlook/gmail and you should be able to see the field added and create/save the records going forward.
If you run into any issues – please shoot us an email at firstname.lastname@example.org