New to forum but been using Simply/Sage 50 for excess of 10 years.  I am not an accountant - just a bookkeeper.

My accountants years ago wanted me to do basically the same thing except in the AR module.  This is how I handled it.  I made them a customer with the name of  "ZZ Accountants - Year End"  so anything I posted to this customer account  would automatically go into the A/R Control Acct.  (used ZZ so I could quickly find it). In my situation all they wanted to do was move customers that had a credit balance, because of down payments, into a liability account.  So I opened up the new "customer" account and issued an "invoice" to DR the A/R customer account and CR the Liability Acct. Then on Jan 1 of the new year I would issue a cr invoice to move it out.  CR the A/R customer account  and DR the Liability Acct.

In your situation I would open a new vendor using a phony name like I did above and divide their adjustment into 2 separate invoices, as you suggested above, and use whatever you want for the invoice #.  (I used their adjusting entry #)

Then let your accountant know how you handled it.

Haha - I just took another look at all the suggestions - looks like you might have solved it.

New to forum but been using Simply/Sage 50 for excess of 10 years.  I am not an accountant - just a bookkeeper.

My accountants years ago wanted me to do basically the same thing except in the AR module.  This is how I handled it.  I made them a customer with the name of  "ZZ Accountants - Year End"  so anything I posted to this customer account  would automatically go into the A/R Control Acct.  (used ZZ so I could quickly find it). In my situation all they wanted to do was move customers that had a credit balance, because of down payments, into a liability account.  So I opened up the new "customer" account and issued an "invoice" to DR the A/R customer account and CR the Liability Acct. Then on Jan 1 of the new year I would issue a cr invoice to move it out.  CR the A/R customer account  and DR the Liability Acct.

In your situation I would open a new vendor using a phony name like I did above and divide their adjustment into 2 separate invoices, as you suggested above, and use whatever you want for the invoice #.  (I used their adjusting entry #)

Then let your accountant know how you handled it.

Haha - I just took another look at all the suggestions - looks like you might have solved it.