SUMMARY:
This technical note documents a known issue in which the error "Object BaseAttributeForm has already been deleted or is in an invalid state" is seen when trying to remove the first source table from an attribute form sorted alphabetically in Strategy 10.0-10.3. A resolution has been provided.
SYMPTOM:
The error "Object BaseAttributeForm has already been deleted or is in an invalid state" is seen when modifying attribute form's source tables in Strategy 10.0-10.3. This is seen when removing the first table sorted alphabetically in the list. Removing other source tables does not cause an error.

Object BaseAttributeForm has already been deleted or is in an invalid state.