Transaction Issue in MDS API

Hi,

I'm trying to implement transaction in MDS through service. I'm inserting a member through EntityMembersCreate().

If there is any error while inserting, i need to revert this member entry from MDS [Like ROLLBACK transaction in TSQL].

           // Create a new entity member
            OperationResult operationResult = new OperationResult();
            Collection<MemberIdentifier> InsertedMembers = new Collection<MemberIdentifier>();
            InsertedMembers = mdsProxy.EntityMembersCreate(international, entityMembers, true, out operationResult);


          // Reverse Transaction
            int iTransID = InsertedMembers[0].InternalId;//NOT GETTING TRANSACTION ID FROM MemberIdentifier
            Collection<ReplacementId> Replacement = new Collection<ReplacementId>();
            mdsProxy.TransactionsReverse(international, new Collection<int> { iTransID }, out Replacement);

1) I couldn't able to get the transaction ID in from the EntityMembersCreate. 

2) I found when there is an error in any attribute in member, then all other attributes are getting inserted expect that. Partial member is inserted even if one attribute is error out.Ideally I was expecting ALL OR NOTHING. 

Please advice on the above 2 queries.

Thanks in Advance!

- ANAND