PROJ_ENQ 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 "Project Locking Key" 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_PROJ_ENQ TYPE PROJ_ENQ.
The PROJ_ENQ table consists of various fields, each holding specific information or linking keys about Project Locking Key data available in SAP. These include TYP (Object type, projects), PSPID (Project Definition)... 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. .