# How to post or validate an invoice

**URL:** https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321
**Category:** User
**Created:** [October 5, 2020, 12:59pm UTC](https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321 "2020-10-05T12:59:51Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![sic1010](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/s/48db29/32.png) [@sic1010](https://discuss.tryton.org/u/sic1010)
#### Post date: [October 5, 2020, 12:59pm UTC](https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321/1 "2020-10-05T12:59:51Z")

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So I’m trying to post an invoice, but I get a pop up saying I must create a period for the date,  
What does this mean?

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### Author: ![dave](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/d/ee7513/32.png) [@dave](https://discuss.tryton.org/u/dave)
#### Post date: [October 5, 2020, 1:24pm UTC](https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321/2 "2020-10-05T13:24:04Z")

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This means you haven’t created a period with a start date before, and an end date after, the date of the move that goes with the invoice.

To create a period you need to create a Fiscal Year: [Financial → Configuration → Fiscal Years → Fiscal Years](https://demo.tryton.org/model/account.fiscalyear;name=%22Fiscal%20Years%22).

Also see:

- [How to create a Fiscalyear](https://discuss.tryton.org/t/how-to-create-a-fiscalyear/2380)
- [https://codereview.tryton.org/292271005/diff/296341003/doc/usage.rst](https://codereview.tryton.org/292271005/diff/296341003/doc/usage.rst)

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### Author: ![sic1010](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/s/48db29/32.png) [@sic1010](https://discuss.tryton.org/u/sic1010)
#### Post date: [October 5, 2020, 1:41pm UTC](https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321/3 "2020-10-05T13:41:50Z")

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Thanks. I’ll have a look

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### Author: ![sic1010](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/s/48db29/32.png) [@sic1010](https://discuss.tryton.org/u/sic1010)
#### Post date: [October 5, 2020, 7:13pm UTC](https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321/4 "2020-10-05T19:13:31Z")

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Finally got it right. Thanks.

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### Author: ![system](https://discuss-cdn.tryton.org/uploads/default/original/1X/c6f8ec0a40525cdcd50058c734283450a4b3d38b.png) [@system](https://discuss.tryton.org/u/system)
#### Post date: [November 4, 2020, 7:13pm UTC](https://discuss.tryton.org/t/how-to-post-or-validate-an-invoice/3321/5 "2020-11-04T19:13:32Z")

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