Error in material document posting

[rangac]

I am getting an error while posting goods receipt.

Number range for trans. / event type WA in year 2007
does not exist.

I have defined the number ranges for accounting
documents, for material and physical inventory
documents and for reservations in inventory management
and physical inventory documents. The group WA is
attached to the group material documents for goods
movement types and inventory differences.

I have also used transaction OBH2 to copy the number
ranges to the fiscal year 2007.

Why am I still getting this error? Are there some
settings I have not made?

Please help me.

Thanks

Ranganath