sales organisation in STO PO for plant is't coming properly

Dear all,

all required setting for STO PO is done

and while creating STO PO shipping tab is coming but the sales organisaiton maintained for the customer which is maintained for the PLANT is not coming properly.

i.e i created one customer master with one sales organisation later i got to know it was assiged to wrong sales organisation so i block the customer for the sales organsation and extended to desired sales organisation.

so in STO PO , PO is getting saved properly but at shipping tab the sales organisaitn is coming for the older (blocked one)...i need to have it for the newle extened one

Pl suggest

Regards,

Vimlesh