Field is read-only after writing an open ACL, and the field's sys_dictionary entry is not marked as read-onlyIssue Field-level WRITE ACL will not make field editable. Even writing an 'open' field-level ACL does not grant WRITE access. The field's sys_dictionary entry is not marked as read-only. Also ACL debugging will indicate green, passing WRITE ACLs. CauseThe cause my be an associated sys_dictionary_override associated to the sys_dictionary entry of the field. If this sys_dictionary_override record has the 'read-only' checkbox mark, the field will not be editable. ResolutionOpen the sys_dictionary entry fieldScroll down to the 'sys_dictionary_override' related listOpen a sys_dictionary_override record whose 'Table' corresponds to the form where the field it is located Uncheck the 'read-only' checkbox