I'cant update the variant in transaction OBPM4

Hi,

I tried to customized a payment medium.

I followed the next spteps:

1.- I created a payment format in transaction DMEE

2.- In transaction OBPM1, I customized the format

3.- In transaction FBZP I assigned the payment medium.

4.- In transaction FBPM I created the variant.

5.- In transaction OBPM4 when I tried to add the variant I can't modify the fields: Company Code, Bank Key, ....etc. only the field Sel.Variant is available. Why?

I don't know how to activated the fields: Company code, bank key, bank contry, bank key, house bank, acct id, payment direction direction, and payment method?

The first column say: No separation of payment medium output ¿?

Somebody could help me?

What is wrong?

Please help me!

Best regards

Adriana Rivera