B1isn error

Dear All,

i have the following error .

com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception: com.sap.b1i.bizprocessor.BizProcException: BPE001 Nested exception: com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception: com.sap.b1i.xcellerator.XcelleratorException: XCE001 Nested exception: java.lang.RuntimeException: DI Error: (-5002) [OCRD.Currency] , 'Linked value USD does not exist'

Any suggestions,

Regards,

Gebaly