newbie help with AP

I'm just getting started with SQL-Ledger and am having trouble entering the invoice from my service provider. I created the Vendor, then in AP entered a Vendor Invoice (without payment). Then I tried to enter a payment for that invoice, but it didn't show up in the "Outstanding" report. I also tried entering an AP Transaction, the invoice and payment at the same time, but that didn't show up in the GL. 
I'm not only new to SLQ-Ledger, but also to accounting. Any help would be greate. Thanks in advance.

		
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