9.2 GR from production - Work Center Bin

Hello experts,

I'm tring to do a GR from production.

RF> Inbound Process> Reciving of HU> Rec. HU BY Manufacturing Order> Rec.HU by HU.

I select my Work Center, F915: wich has following characteristics:

• it is assigned to a standard work center lay out VPMX
• it is assigned to Storage type F915 with has storage type Role Work Center in Staging Areas Group
• and It is assigned to a bin with the same name F915.

And I'm getting this error:

E: Storage bin for goods movement postings not determined (/SCWM/DELIVERY012)

why if the Work center is assigened to a bin, the system does not find a bin to GR?

many many thanks for your help

Cheers

Natalia