Packed amount does not match reserved amount for item (282-354) [1.0 / 0.0]

[Rupinder]

Hi,
     After approving a order and selecting the "Pack Shipment for ship group" option. Order packing form is displayed. After selecting the products to be packed, when i select the "Complete" option, the following error is displayed:

"Packed amount does not match reserved amount for item (282-354) [1.0 / 0.0]"

Here "(282-354)" is the internal name of the product and 1.0 is the price for it.

Plz help me.