Ignore large Purchase Order

Hello, 

I have a question related to a large stock up and I am hoping there is a way IFS can handle. I setup a large qty PO for a bank build. However, I am hoping to somehow flag that PO to be ignored by MRP, as it is unique. The issue is that this large purchase skews the forecasting/demand. 

I’ve gone through the help and do not see anything that seems to indicate if this scenario can be handled. Any guidance would be appreciated. Thank you.