Line item Delivery block is greyed out
I want to restrict the transfer of Requirements for those Sales orders line items which needs Sales Order BOM for Make to Order scenario. So that Requirement does not get transferred with Standard Production BOM until the Sales Order BOM is created. For that I want to put a delivery block at line item which will restrict transfer of Requirement. However Delivery block field is grey in Main Screen of Sales order in shipping tab.
Can the delivery block be always put in Header or at Schedule line level and Not at line item level.