Prepare document creation for certain items

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Reason: Purchase items have been replaced by new line items.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 https://docs.nitrobox.io/reference/preparedocuments_4.
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. Request to invoice all provided Purchase Items that are "on hold". Fails is a purchase item reference is provided that has been billed or canceled.
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