Reconciliation account
A reconciliation account is a G/L account that is linked to the subledger. Initially, when I was learning SAP, it took me a while to understand this concept of why there is a G/L account even when I post to a vendor account, customer account, etc.
A recon account is entered on the master data of a vendor, customer, etc.
Open a vendor master using Fk02 and go to the tab that has the reconciliation account.
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Go to FB60 and make a posting. We are doing this so we can see where this recon account gets updated.
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click on the simulate icon
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This will show you the posting that it is going to make.
You will notice that there is a vendor account and a G/L account. Where is the recon account?
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The recon account is currently not shown on the screen. You have to change the layout to see this field.
Click on the change layout icon.
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The account field was on the right, I selected it and then selected a place on the left and click on the left arrow. And the field moved to the left.
We should see the account right below the G/L account. When an account doesn’t have a recon account, then you will see the regular account in this field.
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The recon account field shows up now.
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The 160000 field is the one that was entered in the vendor master. Basically, anytime you post to a subledger, it should update the G/L ledger as well through a recon account.
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Enter the G/L account that was used in our posting from the previous step, click on all items and execute.
This account is managed on a line item basis which allows us to view all the postings for this account.
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You will see the postings for this account
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repeat these steps for the recon account.
Note- A recon account might not be line item managed. I have made it as line item managed to show you that the postings got updated in the recon account as well.
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Click on execute after entering the recon account.
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The posting got updated in the recon account as well.
So our posting updated the vendor ledger, the G/L account that was the offset to the vendor posting and the recon account that was used in the vendor master.
Make a few postings and run FBl3n and view the documents in FB03 to get fully understand the concept of a  recon account.
Pre-requisite- An Account group has to be set up for a recon account in configuration