PRCT_HEAD_DB_DYN 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 "Dynamic Fields of Database Buffer for PRCD_HEAD" 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_HEAD_DB_DYN TYPE PRCT_HEAD_DB_DYN.
The PRCT_HEAD_DB_DYN table consists of various fields, each holding specific information or linking keys about Dynamic Fields of Database Buffer for PRCD_HEAD data available in SAP. These include REC_ORIGIN (Source of Data Record in Buffer)... 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. .