write soap response from multiple test cases to 1 DataSink

Hi,

I am trying to write the soap response from multiple test cases to 1 DataSink. Here's my setup:

MyTestProject
-MyTestSuite
--MyTestCase1
---TestStep_MyDataSource
---TestStep_SendSoapRequest1
---TestStep_MyDataSink (settings are OutFile=c:/temp.xls, WorkSheet=Sheet1, Start At Cell=A1)
--MyTestCase2
---TestStep_MyDataSource
---TestStep_SendSoapRequest2
---TestStep_MyDataSink (settings are OutFile=c:/temp.xls, WorkSheet=Sheet1, Start At Cell=B1)
--MyTestCase3
---TestStep_MyDataSource
---TestStep_SendSoapRequest3
---TestStep_MyDataSink (settings are OutFile=c:/temp.xls, WorkSheet=Sheet1, Start At Cell=C1)

So I am trying to write the soap responses from the three Soap Requests into one Excel workbook and into one worksheet but to different cells/columns (A for 1st, B for 2nd, C for 3rd). When I run this test suite only the responses from the 3rd request are written to the column C and columns A, B are empty, whereas I am expecting soapui to write response for request1 to col A, from request2 to col B and from request3 to col C.

I am using SoapUI Pro 4.5.1. Any ideas why that is happening and how it can be fixed?

thanks.