can not add String in RQM

Hi everybody,

 I need to put the name of my Test Case and the name of my Test Script  by this way:
Test case title  = "TC_"&J&" - "&k
Test Script title = "TS_"&J&" - "&k
Where J and K are Excel cells,

using this J&" - "&k, works but when I put this other value "TC_"J&" - "&k, Excel export utility, creates me 5 artifacts  instead of 2 and 3 are marked as errors.
 
Could you give me some help please ?
This is my configuration file:

//Test Script
testscript.XLSStartRow=20
testscript.dc:title="TS"&J&" - "&k
testscript.dc:description=L
testscript.steps.type="execution"
testscript.steps.title=J
testscript.steps.name=J&K
testscript.steps.description=N
testscript.steps.expectedResult=O
testscript.XLSDelimeter=\n

//Test Case
//testcase.dc:title= testscript.dc:title
testcase.dc:description=L
testcase.XLSLink=testscript

// Categories
testcase.category term="Category".value=H                  
testcase.category term="Test Phase".value=G

//Prerequisites
testcase.Section("myns:com.ibm.rqm.planning.editor.section.testCasePreCondition","RQM-KEY-TC-PRE-COND-TITLE")=M

and this is the exporting log :

12/2/2012 10:28:25 AM:
--------------------------------------------------------------------------------
12/2/2012 10:28:25 AM:
SESSION: 12/2/2012 10:28:25 AM

12/2/2012 10:28:25 AM: Getting artifacts from current document TIM TOP 6.0 UI Iteration 3 Wave A v1.4_SD comments Nov 26.xls
12/2/2012 10:28:25 AM: Created 5 artifacts, sending to server
12/2/2012 10:28:25 AM: sending testscript0 named TIM_A_v1.4_SD_comments_Nov_26_US648_1.xml
12/2/2012 10:28:27 AM: Server returned code OK
12/2/2012 10:28:27 AM: sending testcase1 named TIM_A_v1.4_SD_comments_Nov_26_US648_1.xml
12/2/2012 10:28:29 AM: Error sending to server TIM_A_v1.4_SD_comments_Nov_26_US648_1.xml of type testcase
12/2/2012 10:28:29 AM: sending testcase2 named TIM_A_v1.4_SD_comments_Nov_26_US648_2.xml
12/2/2012 10:28:32 AM: Error sending to server TIM_A_v1.4_SD_comments_Nov_26_US648_2.xml of type testcase
12/2/2012 10:28:32 AM: sending testcase3 named TIM_A_v1.4_SD_comments_Nov_26_US648_3.xml
12/2/2012 10:28:35 AM: Error sending to server TIM_A_v1.4_SD_comments_Nov_26_US648_3.xml of type testcase
12/2/2012 10:28:35 AM: sending testcase4 named TIM_A_v1.4_SD_comments_Nov_26_US648_4.xml
12/2/2012 10:28:41 AM: Error sending to server TIM_A_v1.4_SD_comments_Nov_26_US648_4.xml of type testcase
12/2/2012 10:28:41 AM: finished writing artifacts