This error can occur when a User creates a User Defined Field (UDF) within the Customer section of Accounts Receivable and then deletes it.
The next time a user attempts to edit a customer record they will receive the following error message:
This error is caused because Evolution thinks the UDF is still active. While the created field may not appear in Evolution it still resides in the SQL tables.
To resolve this error:
1. Take a Backup
2. Delete the field from _rtblUserDict table in SQL
3. Check if the error persists
Alternativly you could make a copy of the company.