I want to use this FORM or SUBROUTINE in other forms.
Now, I want to use it in this form:
"But how do I get the value of the internal from another form into this form?
"I want to use the it_j1bnfstx and maybe loop it into ls_j1bnfstx.
"I also want to use the data of Z_SELECT_STATEMENT here in this FORM COMP_VAT.
I'd give a more detailed answer, but you edit your last question https://answers.sap.com/questions/13993203/how-to-read-the-character-length-the-value-of-a-fi.html to "wrong question", so I'm not sure it's worth it.