Yaswanth,
QA in sales order is 137324, which is different from QA (80616) in SH.
Is QA in SP too? Where is QA 137324 (in which partner function SP, BP etc.)?
If in the partner procedure, which is assigned to the Sales document type; the field Source = SH, then the value of QA shall populate from SH. In this case 80616.