KF Calculation if one of 2 inputs are not initialized

Hi,

I have a calculation that that selects the higher value between 2 KF.

The calculation works only if both KF are initialized, I would like for it to work even if I have only a value in one KF.

Is this possible ?

Do you have tricks to initialize a KF without have to actually load data in it ?

Here is my calculation:

IF(  "KAMLIFTCENTSOFF@PERPRODPOSPROMO"  -  "KAMLIFTCENTSOFFW1@PERPRODPOSPROMO1"  > 0 ,  "KAMLIFTCENTSOFF@PERPRODPOSPROMO"  ,  "KAMLIFTCENTSOFFW1@PERPRODPOSPROMO1"  )

Here is the Screen of the Planning View (I want the red areas to be calculated):