UPF_YS_TECHF 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 "Planning: Technical Error" 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_UPF_YS_TECHF TYPE UPF_YS_TECHF.
The UPF_YS_TECHF table consists of various fields, each holding specific information or linking keys about Planning: Technical Error data available in SAP. These include REVAL (Planning: Revaluation Percentage Rate), DSTRB (Planning: Distribution Factor), PRSTR (Forecast Strategy), ALPHX (Basic value smoothing using alpha factor)... 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. .