purchase price variance during voucher match

Hi,

Need some information on the variance calculation when Voucher is created against a PO Receipt. In F43121 we find that the field F43121.PRAVCO - "Cost Difference"  captures the variance and the same is reflected in variance account in F0911. However the Cost Method for match type 2 (Voucher) is considered as 8 (Purchasing Base cost) while for receipt variance(Match type=1) the cost method is considered as 07- Standard Cost.

Is this (receipt variance based on standard cost but voucher variance based on Purchase base cost) comes from some setup /configuration or is it standard JDE functionality.

Please advise , we are on WS A 7.3 cume 12.