When CST payable is adjusted against VAT refundable by recording a stat adjustment journal transaction in Tally.ERP 9 Release 5.2, the VAT Refundable value in Form VAT 15 report does not get updated. Although the adjustment value is considered after Recompute , but the update does not retained after Overwrite or Save as Revised .
You have to update to the latest version of Tally.ERP 9 to resolve this issue.