It is possible to use modification templates to import data in items if importing it in the catalog but it isn't possible if we import it in a basket during the acquisition process. For example, I have in the marc framework, all items data are in 995 field and the callnumber in 995$k subfield. In a marc file, I have the callnumber in 921$a. I use a MARC modification templates to copy 921$a subfield in 995$k subfield. If I use this modification template to import a stage file with 921$a in catalog, it creates item with for callnumber the value stored in 921$a. But, if I use this modification template to import a stage file from a basket during the acquisition process, it creates items without callnumber. I hope that I'm enough clear...
Should be resolved since the preference system MarcItemFieldsToOrder exists