HCI DS mapping from ECC to IBP

Hello,

Is there a way in HCI DS to map a field conditionnally as follow:

**************************************

If source field is not initial

then Target field is mapped

else no mapping

***************************************

Is there a way to apply this logic using decode function or ifthenelse?

or

is there a way to use the preload script?

Thanks for your appreciated help

Best Regards

Mejdi BRAHEM