BPC Transformations - IF Condition

Hi,

We are loading the data from SAP BW to BPC cube.

In one of our transformation, for one of the dimension we need to write a IF condition as follows.

IF item_category <> space, then item_category

ELSE IF cost_element <> space, then cost_element

ELSE 'ZZZZZZ'.

I searched SDN, i came to know we cannot use "not equal to" and "multiple IF conditions" in the transformations.

I cannot manipulate the data in the end routine, because item_category and cost_element exists in source structure but not in target structure.

Is there any way to proceed on this?

Thanks

Srinivas.