It isn't possible to change the customer codes - that's why it's wise to choose a system of customer codes at the start that make finding things easier.
eg SMI-001, SMI-002, JON-001 etc
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Never buy black socks from a normal shop. They shaft you every time.
I think you have to wait until you have run year end and then set up a new account, you then delete the old one.
Just as a note, you can only delete accounts if you have run the clear audit trail option which clears transactions from the accounts up to a certain date. If you have not done this then even if the account is balanced at zero you will not be able to delete it. If you run the clear audit trail, use with caution and always keep at least a year's worth of data. (Never run it for the present financial year) and always take a couple of back ups first.
If you don't want to run the clear audit trail there is a way of hiding those Customers that you no longer wish to see/use, by using the Analysis fields in the customer record and the Search option.
It can be done by purchasing a sage ad on - I sell the ones by Adept Solutions if you would like to buy its called - Adept Sage 50 Product and Account Code Changer - approx £ 99 + VAT. Other solution would be if you would like me to do adjustments for you and send over new back up - email if required info@completebookkeeping.co.uk
Sage do suggest first 4 letters then 2 numerical ie BUSI01 Business Exhibitions
If you plan to change yourself I would suggest creating new suitable coding asap and slowly not using the old ones - the sooner you stop using them you can slowly delete after year end/ audit trail - they may take a while to disappear though.
What ever you decide good luck with this.
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Donna Curling - Complete Book-Keeping Ltd (CBKLtd) - 07939 101900