Why does system prompts to select Tran Type ( (Opening balance or Stock adjustment)) while saving Adjustment Receipts?

Explanation:
Adjustment Receipt option is used only for those materials which we found excess while last lot adjustment. After entering the refser as ‘ADJRCP’. System prompts to select Tran type field before adding details adjustment receipts. It is mandatory and user defined. However, to differentiate between opening balance or stock adjustment this field is important.
Please see the screenshot for reference: adjustment receipt.png