# Manage.io does not give warning of duplicate sale invoice number **URL:** \ **Category:** Uncategorized\ **Created:** [January 17, 2018, 3:00pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845 "2018-01-17T15:00:03Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![sourav\_bhalla](https://avatars.discourse-cdn.com/v4/letter/s/f4b2a3/32.png) [@sourav\_bhalla](https://forum.manager.io/u/sourav_bhalla)\ **Post date:** [January 17, 2018, 3:00pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/1 "2018-01-17T15:00:03Z")
if by mistake i enter old invoice number then it should say warning about it ---
**Author:** ![sharpdrivetek](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/sharpdrivetek/32/34244_2.png) [@sharpdrivetek](https://forum.manager.io/u/sharpdrivetek)\ **Post date:** [January 17, 2018, 3:30pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/2 "2018-01-17T15:30:13Z")
Manager has automatic numbering for invoices which does not produce duplicate invoice numbers. if you are manually entering the invoice numbers, then it is your responsibility to avoid duplicates. ---
**Author:** ![sourav\_bhalla](https://avatars.discourse-cdn.com/v4/letter/s/f4b2a3/32.png) [@sourav\_bhalla](https://forum.manager.io/u/sourav_bhalla)\ **Post date:** [January 18, 2018, 12:57pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/3 "2018-01-18T12:57:34Z")
Thank you Sir. i my other software i use number as. “Pay1” for Expenses and Payment to Supplier. “RCV1” For Income & Receipt from Supplier. “CON1” For Bank Transfer & Withdraw & Deposit in Bank “JRN1” For Journal Entries. “INV1” FOR SALE “PUR1” FOR PURCHASE How Can i Do that or Replace That in [Manager.io](http://Manager.io) please explain with example: Again Thanks for all Support giving ---
**Author:** ![sharpdrivetek](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/sharpdrivetek/32/34244_2.png) [@sharpdrivetek](https://forum.manager.io/u/sharpdrivetek)\ **Post date:** [January 18, 2018, 1:32pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/4 "2018-01-18T13:32:24Z")
at present Manager accepts only numeric for automatic numbering. so you should think of a compromise like allocating a unique series of numbers for different forms. for example, for sale you can use a numeric series 171800001. the next invoice will be automatically numbered 171800002 ---
**Author:** ![Tut](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/tut/32/3286_2.png) [@Tut](https://forum.manager.io/u/Tut)\ **Post date:** [January 18, 2018, 2:16pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/5 "2018-01-18T14:16:44Z")
> [@sharpdrivetek](#): > > you should think of a compromise like allocating a unique series of numbers for different forms. This is unnecessary, because Manager already assigns numbers from different series for different forms. While you cannot tell what form is involved exclusively from the number, there is no need to, because every place the form appears its type is obvious. You will either be looking at a list of sales invoices, for example, or viewing the form itself, which has a clear title. ---
**Author:** ![sharpdrivetek](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/sharpdrivetek/32/34244_2.png) [@sharpdrivetek](https://forum.manager.io/u/sharpdrivetek)\ **Post date:** [January 18, 2018, 2:18pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/6 "2018-01-18T14:18:42Z")
by compromise i meant using all numbers and not alphabets or such presently the practice followed by @sourav_bhalla ---
**Author:** ![Tut](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/tut/32/3286_2.png) [@Tut](https://forum.manager.io/u/Tut)\ **Post date:** [January 18, 2018, 2:19pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/7 "2018-01-18T14:19:38Z")
Understood. ---
**Author:** ![Ealfardan](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.manager.io/ealfardan/32/63166_2.png) [@Ealfardan](https://forum.manager.io/u/Ealfardan)\ **Post date:** [January 18, 2023, 3:22pm UTC](https://forum.manager.io/t/manage-io-does-not-give-warning-of-duplicate-sale-invoice-number/13845/8 "2023-01-18T15:22:07Z")
Closed on January 18, 2023, 3:22pm UTC