In the previous step you created a concept for a scenario a BAPI could be applied to. You also defined the relevant SAP business object types.
Before you implement the scenario and begin defining and developing the BAPI, you should carry out a review of the scenario.
You should carry out the review of the BAPI scenario together with all the people involved in the development of the BAPI and those responsible for quality control in your development group.
Confirm that the scenario as it stands is meaningful and that the BAPIs in the scenario can interoperate without any problems.
Start developing the BAPI only after you have successfully completed the review.