CMPB_ASGN is a standard SAP Table which is used to store Campaign Assignment data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The CMPB_ASGN table consists of various fields, each holding specific information or linking keys about Campaign Assignment data available in SAP. These include VBELN (Sales and Distribution Document Number), POSNR (Item number of the SD document), CAMPAIGN (Generic project planning: GUID from external R/3 system), SEQNO (Campaigns: Counter for Sequence)... 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. .