Suppress Nodes with 1 required Element and 3 unrequried Elements

Hi all

I read an intresting posting by Stephen W. Thomas

see link below 

http://www.biztalkgurus.com/blogs/biztalk/archive/2005/01/27/How-to-Suppress-Nodes-In-the-BizTalk-Mapper.aspx 

which work fine for my programme..

But I have a diffrent situation. The Element ESR_Number is requried 

while the rest are optional.. I applied Thomas Technic but it did not work 

<100_ZE>

  <ESR_Number>243721000000201451901059994</ESR_Number>

  <010_ESR>010001456</010_ESR>

  <020_ESR>>9</020_ESR>

  <030_ESR>04</030_ESR>

 </100_ZE>

 Any Ideas will be appricated

Ed