Delivery cost (loading cond. ) problem , during good receipt

Hi Guru's

i am facing problem that , i make the purchase order of 100 quantity , with gross price 500/ item , and loading cost 1000 inr extra , this loading condition having characteristics , cond. class -A (disc. and surcharge )

Calculation type -B (fix amount)

condition category -B (delivery type)

but i have received 80 quantities , and after GRN system showing accounting document as

Inventory - Raw Mat DR by 40000

gr/ir acc. CR. by 39200

loading provision account CR by 800

but i want delivery cost Credited by 1000 inr , so what should i do , is it problem with my condition type ,or pricing procedure , should i make any changes in it , because this loading cost is not depend on item quantity ,

or should i do any other scenario for this please suggest

Regards

akshay kukde