Work Order Operation related Item Number Open, Reserved and Required Quantities table or formula?

Hi there,

I am looking for information regarding the Open, Reserved and Required quantities of an item related to a worked order operation are stored in which table ??

Or do we have any formulas to calculate these values. I checked the "Wie_wo_operation_materials", though there are few quantity columns, but there are direct column names for Open, Reserved and Required quantities. Please provide your inputs or suggestions on this.

Supply chain execution → Work execution → Mange Work Order → Work Order Operations → Items