You have two option..
Either make the info update field as mandatory from field selection..
Or you can create a transaction variant from SHD0 for the t-code ME31K...
Check the thread Default Info Update at contract level | SCN
You have two option..
Either make the info update field as mandatory from field selection..
Or you can create a transaction variant from SHD0 for the t-code ME31K...
Check the thread Default Info Update at contract level | SCN