PRHIS is a standard SAP Table which is used to store Standard WBS, Edges (Hierarchy pointers) data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The PRHIS table consists of various fields, each holding specific information or linking keys about Standard WBS, Edges (Hierarchy pointers) data available in SAP. These include POSNR (Std WBS: Internal project item number (w/exit on ID)), PSPHI (Current number for standard project), UP (No. of the superior standard WBS element), DOWN (No. of the first subordinate standard WBS element)... 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. .