Propose the Amount and the Quantity on the MIRO transaction screen

Hi experts,

I need to change the value of the amount and quantity column in the miro transaction screen after you enter the purchase order, the new values ​​are calculated with other purchase order data displayed on the same screen.

I used the badi MRM_HEADER_CHECK but the values ​​are not changed on the screen if I modify the contents of the internal table TI_DRSEG.

Please help

Best Regard.

Robert