WTADAB is a standard SAP Table which is used to store Additionals: Documents data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The WTADAB table consists of various fields, each holding specific information or linking keys about Additionals: Documents data available in SAP. These include ADDIBELNR (Document number for additional), ADDIPOSNR (Item number of an additional), ADDISTUNR (Additionals: step number), LFDNR (Key for transaction data for additionals)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .