ABAP/ BDC

Question:
Question about BDC program. This is FI related. When or how do we decide to use the standard BDC program RFBIBL00 or RFBIKR00, instead to completely customise a BDC program based on the transaction and the external file. In other words how are these programs important when loading G/L accounts. G/L accounts can be loaded thru a completely custom BDC too.
thnx.
Answer:
A custom program, you would need to trace the screen and code those in your program. This is at disadvantage when you upgrade your SAP. The screens may be different and you would need to thoroughly test your programs. Often time you would need to upgrade your custom programs with any new screens.
For the Direct input method, you're not concerned with screens. You would just know how to correctly map the fields and everything is directly uploaded to the tables through the SAP standard programs. This is somewhat difficult if you're not used to working with these programs compared to just tracing through the screens.

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