Odoo is the world's easiest all-in-one management software. It includes hundreds of business apps:
CRM | e-Commerce | Accounting | Inventory | PoS | Project management | MRP | etc.
Create an invoice for a partner ABC of an amount 400, and validate the invoice.
And from the Payment menu create a payment against the same partner ABC for a partial amount, let it be 150.
Now if we reconcile this payment using the Payment matching button inside the payment form, you will be asked to write off the remaining amount(ie, 250).
How to reconcile partial payment without write off
The solution is that we have to click on the shown portion in the below image,
Upon clicking the portion the write-off will disappear.
And now by clicking the reconcile button, we can reconcile the partial amount.
You can see the same in this video: How to Reconcile Partial Payment without write off in (Odoo 11)