What is vbbk in sap?

TDOBJECT is the name of the text object (e. SAP Long Text Vbbk Tables: STXH — STXD SAPscript text file header, TLINE — SAPscript: Text Lines, THEAD — SAPscript: Text Header, STXL — STXD. SAP Text Vbbk Tables: STXH — STXD SAPscript text file header, TLINE — SAPscript: Text Lines, THEAD — SAPscript: Text Header, VBRK — Billing Document:. With function READ_TEXT_INLINE you find text for header and item. Hello, i need an additional Text in the text object VBBK (Sales Document Header).