Add agreed deposit to purchase item

This operation has been deprecated and will be removed in the future!
Reason: Purchase items have been replaced by new line items.
This operation is replaced by
Deprecated since: 2023-03-01

Sunset at the latest: 2024-02-29

Please refer to our "API Lifecycle Management" and our "API Migration Guide" to find out more.

DEPRECATED: Use the line items endpoints instead. A request to add new agreed deposits to purchase items to an existing contract.