What is the problem, using web service ManageProductionProposalIn?

Hi experts,

I execute the ManageProductionProposalIn in SOAP ui, I try as the document:

http://www.w3.org/2003/05/soap-envelope" xmlns:glob=" http://sap.com/xi/SAPGlobal20/Global">
<soap:Header/>
<soap:Body>
<glob:CreateProductionProposal>
<!--1 or more repetitions:-->
<CreateProductionPlanningOrder>
<SequenceNumber>4</SequenceNumber>
<SupplyPlanningAreaID>72990000</SupplyPlanningAreaID>
<MaterialID>1001</MaterialID>
<MaterialAvailabilityDateTime timeZoneCode="UTC">2016-12-05T12:00:00.1234567Z</MaterialAvailabilityDateTime>
<Quantity unitCode="TNE">3</Quantity>
<QuantityTypeCode>TNE</QuantityTypeCode>
</CreateProductionPlanningOrder>
</glob:CreateProductionProposal>
</soap:Body>
</soap:Envelope>

But the result is:

http://www.w3.org/2003/05/soap-envelope">
<env:Header/>
<env:Body>
http://sap.com/xi/SAPGlobal20/Global" xmlns:prx="urn: sap.com:proxy:LCW:/1SAI/TAE47CE34C124351201BE46:804">
<ProductionProposalsCreated>
<SequenceNumber>4</SequenceNumber>
</ProductionProposalsCreated>
<Log>
<Item>
<Note>Creation failed for sequence number 4;Technical error PRPO 015</Note>
</Item>
</Log>
</n0:CreateProductionPlanningOrderResponse>
</env:Body>
</env:Envelope>

The SequenceNumber, I use 1 2 3 4 ...10, it is the same result.

What is the problem?

Thanks.