I'm running Sage 100 Premium, 2017.    I am not using PO's.

A vendor wanted us to forward a payment to them before we have invoices.   Also, the advance will end up being less than the total we pay to the vendor.  (Example: we prepay 1,000, but the invoices will end up being 2,000). 

How do I enter the prepayment and have it show up as a credit on the account?   How do I then apply the invoices to this prepayment amount?

Will this affect the aged invoice report?    Will it affect 1099 amounts?

I am fairly new to Sage and trying to figure out the best way to record this transaction.

Thanks.