Message SAP VT620 - Quantity/value pos/neg field must be ' ' for credit memos to billing docs

Diagnosis In the controls for copying billing document (F2) from credit memo (CR)or debit memo (DR), the quantity/field value must be ' '. This messageappears if VBTYP for the source billing document is 'M' and if VBTYPfor the target document is 'O' or 'P'. This copying control means thata credit memo or debit memo is created directly from the billingdocument. Procedure Enter ' ' in the Quantity/value ' ' field.