Put values in key figures 9AAFCST

Hello,

i've added key figure 9AAFCST in a planning book and I need it to be an input/output key figure to introduce manual values.

I've set it to an input/output jeyfigures in row definitions in tcode /SAPAPO/SDP8B - Define Planning Book, but when I put the values and save, system deletes all values.

Does anyone know why?

Thanks,

Teresa