PRCT_GROUP_KEY is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Key Group Conditions" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_PRCT_GROUP_KEY TYPE PRCT_GROUP_KEY.
The PRCT_GROUP_KEY table consists of various fields, each holding specific information or linking keys about Key Group Conditions data available in SAP. These include KALSM (Pricing Procedure), KSCHL (Pricing - Condition Type), VAKEY (Variable Key 100 Bytes), KNUMH (ID of a Condition Record)... 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. .