Creates an inventory hold, which keeps the held units from being shipped.

General description

• Currently every hold is placed on an Advance Shipping Notice (ASN): it covers products expected on the receiving and must be created before the receiving starts being received; afterwards the request is rejected. Other kinds of holds may become available later.
• Each item holds one product, optionally narrowed down to a single lot number and/or expiration date.
• A single ASN can carry several holds, each identified by the returned inventory_hold_uuid.