Hi, Sammy,
There is no setting within Adagio to cause this. It is very possible there is something at your site creating it.
However, if you'll provide me the exact version(release date) of both Ledger and Payables you are using, along with the exact steps (keystokes/mouse) you are doing when this occurs, I will see if I can recreate the situation here.
Also, am I correct that you alrady have AP open when you post in Ledger? What windows do you have open in each module at the time you do the post?
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Regards,
Softrak Tech Support