check below
Reason and Prerequisites The reference characteristic that refers to field SDCOM-VCOND was not included in the class of the configurable material.
Solution Use Transaction CL02 to assign the reference characteristic that refers to SDCOM-VKOND to the variant class (300) of the configurable material.
please make this changes and use VA02 to change sales order and re read pricing.
Hope it will work.
Thanks
Ritesh