STO Creation via FHSPORCR102 Idoc - automated determination of generic article

Dear experts,

My question is related to Fashion Management.

I have Generic Material and than several articles linked to it.

To create a STO I am using FSHPORDCR102 Idoc. My problem is that if I have in the Idoc only article, generic material is not created automatically in the STO. (In the customizing I have checked flag for Generic Article Creation ).

But still STO is created just with Article.

This works fine for Sales Order creation with Idoc FSHORD03, but I am not able to achieve the same result for STO.

Thanks in advance for help.