invoice text on tx:fbl5n

Good day,

I have an issue with the text of my invoice from SD not displaying in tx:fbl5n; the BPP is as follows:

1. create sales order
2. create billing document referencing sales order

However when I display the document number generate from tx:fbl5n I see a frame titles addition data. form this screen I can edit the text field from the document number generated. when I save and refresh the report the text appears on tx:fbl5n.

Where can I find this additional data frame from using tx: va01 or vf01?

Or where can i find the text field in va01 or vf01?

Regards,

Tolu