Tolerance Key in MIRO

Hi ,

What tolerance key is to be used in case of my GR amount has very big difference with the amount in logistic invoice verification i.e. in MIRO so that system should always give me error message. And what is the way if i want to restrict this difference to 1 rs only.

Right now if i am suppose to pay vendor rs 1000 and if i am posting invoice with rs 1 only still system is posting this and rest of amount is going to round off account. how this account is determined.

Regards

Vivek