CAP_BASED_ON_POSTED_FLOW is a standard field within SAP Structure E1FVDEXP_DATA_REQUESTED that stores information relavant to this field. Below is the list of its attribute values including length, decimal places, checktable, data type, any assigned search help etc... You could also view this information on your SAP system if you enter the table name E1FVDEXP_DATA_REQUESTED into the relevant SAP transaction such as SE11 or SE80.