Set Minimum Release Amount control (Agreement's line) to warning

As described in the summary, we want the Minimum Release Amount check to be a warning type and not a blocking type.
After creating a purchase agreement and specifying in the item line the Minimum Release Amount, the system will not allow the creation of a purchase order, for the same item, if its amount is less than the amount specified in “Minimum Release Amount” at agreement's line level.
The customer's business needs this check to be warning and non-blocking in order to be able to handle exceptions.
How we can achieve this ?