Changes and Impacts 

1. Creating a Subform 

2. Editing a Subform 

Required  

When a subform is made mandatory, it will apply to all newly created records. For existing records without subform data, the update will take effect only when the records are updated. At that point, the records cannot be saved unless the required subform data is provided.

Maximum Row Entries Allowed 

New records will follow the updated maximum number of row entries in the subform. For existing records, the updated limit will take effect only when the records are edited.

• If the updated maximum row count is greater than the current entries in existing records, there will be no impact.

• If the updated limit is lower than the existing entries, no new entries can be added. The existing entries will remain in the records until the subscriber manually removes them.
  

Custom Fields 

Adding new fields to a subform will not affect existing data. However, the new fields will appear when users edit any existing records.

• If a new field is marked as required, this change will apply to existing records only when they are edited. At that point, the record cannot be saved without providing data for the newly marked mandatory field.

• Once a field is added to a subform, it cannot be removed.
  

3. Deleting a Subform