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Handover 3G Huawei and 2G Motorola(MSC Of NSN) - Unsuccessful

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hieuma's
Handover 3G Huawei and 2G Motorola(MSC Of NSN) - Unsuccessful

Hi everybody,
I have trouble during make handover Inter-RAT Handover(3G_2G)...pleasssee hellp me..urgent..??
Equipment list:
2G: BSS& BTS of Motorola,
3G: RNC and BTS of Huawei
MSC & SGSN: SNS.
Test CS_handover: 3G comming to 2G : success
2G comming to 3G : Fail

Test PS_handover: 2G comming to 3G: Success
3G comming to 2G: Fail
Alarm: SGSN Routing Area Code update Reject.

I have already checked carefully in configuration both, but didnot see anything abnormal.
I try trace on SGSN, hope may finding something...

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Who can help me ...this issue ??
I have query in here. This issue maybe cause by MSC???