Hello
You can not change the prices in the material master. You can change it in MR21 only.
Kindly check my comments above.
You need to maintain "Price unit" as actual ML per bottle in Accounting View 1.
The system will recalculate the Standard price on the basis of available stock. You have to check if the value is correct for the per bottle price.
If not, Correct the price in MR21 for the material.
Regards
SS