I miss this part.
I did an app to transfert stock that work following this steps:
1. The user keyed a product reference -> I load the product BUFFER
2. The user select a stock value to be transfered -> I load the line in a BUFFER
3. The user select an area an place -> I load the line in buffers
4. The user keyed a quantity
5. The user valid the transfert
6. Afte the transfert is done I reset the screen and so would like to reset the buffer to be sure that the user has to keyed every info correctly.