Is it possible to set BOM's Assy Qty to zero

Hi All,

We have a requirement that a consumed material is cannot defined how many qty would be consumed.

For example, a SFC will consume a component material (like Ink). User will mount a bottle of ink onto a machine when the ink is empty. In other words, they cannot define how many consumed qty of each SFC, just replace with a new Ink when the ink is empty.

I would like to ask is it possible to record a SFC assemble which Ink inventory_id and don't care consumed qty? I have tried to set Assy Qty to zero, but SAP ME does not allowed.

Thanks!