If you want to select the item in MIGO transaction you must have to remember that inbound delivery number can be set but you would not be able to set as orientation even though item number can be set for purchase order reference case, while purchasing a goods receipt on MIGO transaction. For initiative delay addition, item level situation is compulsory for inbound delivery as well. Improvement is mandatory in MIGO to permit item level assortment for inbound delivery reference. This is only needed of initiative delay ought to behave like EA-GLTRADE or some other; you must have to new SAP internal BAdi is merger at improvement spot MB_DOC_BADI_ITERNAl. Next you can also generate the above object manually with in your system.
Hope this article might help you to understand the above issue.