75.What does the term ‘source of supply’ mean? Name them. Procurement option for a material.A source of supply can be an external source (vendor) or an internal one (for example, a firm's own plant). The preferred source at any one time can be determined by the system on the basis of quota arrangements, source list records, outline agreements (longer-term purchase arrangements) or info records that have been defined for the material.76.Identify the movement type for a reversal and return to the vendor.