How to delete partial reservation through API

Summary: . Unable to delete partial reservations through API

Content (required):We are following below steps for Back to Back sales orders for partial completion of work orders

Step1- SO creation for Back to Back Make Item 5000 Quantity

Step2- WO has generated for 5000 Quantity

Step3- Partially 2500 Quanity has completed and in reservation UI we are able to see 2 different types of document types for entire 5000 Quantity for particular SO line

Step-4 Partially completed Work order 2500 Quantity will interface to WMS and create ASN in WMS

Step-5- Once ASN Putaway is completed for partial quantity through Interface below three steps are completed