Item Credit Price changed change in sales order while it's not changed

[Eueu12]

Hi all, asking for your guidance why this field is change "Item Credit Price changed" for some materials if we don't change it. field is updated while ZVOML transaction is run and updates second time when try to change material. example SO 3166739668, material 90 (81757058). expected behavior - this field is not changed by system since it wasn't changed.