wrong unit quantities picked in invoices for the material

hi

I have completed a sales cycle for a particular material.

now when i see the Scheduling agreement the quantities in unit(Kg) is perfect but in Invoice the quantity displayed is very very high.

I have checked the master data for the material, and also checked all the conversion rules applied for the material.

but it is perfect.

I checked some other scheduling agreement for the same material and completed the sales cycle it works perfect.

Can anybody guide me from where do this wrong quantities in the Invoice is picked up.

regards

S.C