In addition to the already requested suggestion to "not allow manual journal postings to GL Control Account(s), had I created a field in the previous ERP system implementations, just as an indicator with a Boolean Value, to indicate if a GL Account had been used in any other integration configuration(s). This field is not user editable. The system auto populate this field for all Chart of Account records, if it is used in any integration configuration.
This will enhance the reading of the Chart of Account to the Financial Manager who is in control of manually preventing or allowing manual journal postings to GL Account who should only accept system journal entries, to have better control for decision making to enable or prevent manual journal postings.
A "Where Used" button will further enable the Financial Manager to have a listing of modules and related classed or related posting screens where it had been used in integration settings.