Regarding Round Off Adjustment

My custom formats were using the feild “base_rounded_total” in purchase order. After the latest update in v10, these feilds seem to have stopped working and also, the field “Rounding adjustment” remains blank and disabled. I tried to look for a user manual regarding description about how this rounding adjustment field works, but could not find anything, Please guide urgently

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I’ve tried saving and submitting the document. It still remains blank. I also tried checking/unchecking the disable round off check box in global defaults, it makes no difference to this field. Rounding adjustment remains blank.

This issue is only in the purchase module, It’s working perfectly well in sales invoice!