P4310- W4310A- Editing a row already exited but not yet saved

Hi, we have a couple of users who tend to create purchase orders with lots of detail lines with P4310, form W4310A.

Sometimes it happens that they make a mistake when completing the Business Unit field (MCU )in detail row of the grid,

but they realize about the mistake when they have already exited the row, and thus all the fields that get completed

automatically when you exit a row have already been filled ( among them , ANI, OMCU, OBJ, SUB ).

The users wish the program would allow them to go back to the row whith the wrong MCU, correct that field, and after