Process codification differs by level. Level-1 processes are represented by a capital letter preceded by the letter s (this silent s in small caps stands for SCOR): sP for Plan, sS for Source, sM for Make, sD for Deliver and sR for Return. Level-2 processes add a number for most level-2 processes: sD1 for Deliver Stocked Products, sP3 for Plan Make. Level-3 processes add a period followed by a unique number: sD1.1 for Process Inquiry and Quote, sD1.2 for Receive, Enter and Validate Order. Exceptions exist for Return processes: Level-2 Return processes are split into Source Return (sSRx) and Deliver Return (sDRx) processes to acknowledge the difference between returning something yourself or receiving a return from your customer. The level-3 processes are aligned with these codes: sDR1.1 is Authorize Defective Product Return.