The process of reciprocating financial effects between multiple users or entities by using the attachment voucher feature. Here's how you can achieve this:

1.Enable the "Attach Voucher" feature: In Odoo, go to the Accounting module and navigate to Configuration > Settings. Under the "Journal Entries" section, enable the option "Allow attaching payment to multiple journal items."

2.Create a Voucher: To reciprocate the financial effect, you'll need to create a voucher. Go to Accounting > Vendors > Bills or Accounting > Customers > Invoices, depending on whether it's a payable or receivable transaction.

3.Select the Journal and Attachments: While creating a new bill or invoice, select the appropriate journal for the transaction. Once done, click on the "Attach Voucher" button, usually located at the top of the form.

4.Choose the Counterparty: In the Attach Voucher window, you can choose the counterparty with whom you want to reciprocate the financial effect. This could be another user or entity within your Odoo system.

5.Link Journal Items: After selecting the counterparty, you'll be presented with the journal items associated with that counterparty. Link the journal items to the voucher by checking the corresponding boxes.

6.Validate and Confirm: Once you've linked the necessary journal items, click on the "Validate" button to confirm the attachment voucher. This action will create the reciprocating journal entry in the respective journals of the counterparty.

By following these steps, you can effectively reciprocate the financial effect between multiple users in Odoo with just a click of a button, using the attachment voucher feature. It eliminates the need to re-enter all the transaction details manually, saving time and reducing errors.

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