SAP Message 881008 - User exit can only be used if branch point exists

Diagnosis You tried to activate the user exit for adistributed BOM explosion, without the preliminary Customizing settingshaving been completed. System Response The user exit cannot be activated. Procedure Check the entries for the key SAPMJ7LM/1 and J7LC/1 inREA Customizing -> Adjustment ->Customer-Specific Enhancements.