ISyncChangeBatch::BeginUnorderedGroup
Opens an unordered group in the change batch. Item changes in this group can be in any order.
S_OK
SYNC_E_INVALID_OPERATION when a group is already open or an empty group was previously added to the batch.
SYNC_E_CHANGE_BATCH_IS_READ_ONLY when the ISyncChangeBatch object was created by using IProviderSyncServices::DeserializeChangeBatch.
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