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1. Things can very easily go wrong when you are parsing:
   1. The format of the text in the filter has to be exactly the same as that of the text in the original document. Therefore, always use Courier as font in your text editor in order to have non-scalable characters and thus being able to align spaces. 
   2. The vv's and ss's have to be exactly in the right positions, otherwise the function doesn't work.

2. It is a good idea to copy the original text into the data slot of your PARSE# relation when making a filter. In this way you have guidance while placing everything in the right position.
   Here is an example. The table is pasted into the dataslot and the vv's are written underneath to place them in the right position:

3. Non-Telitab parsing. 
   For the above source document using the filter: 
   
   

   
   the result will be: 
   
   "37816"
   
   and with 
   
   

   
   the result: 
   
   

   
   is obtained 

4. Use of conditional Filter
   A Relation or parameter can contain a set of conditional filters: 
   
   

   this means:

    

    means: "If METH2D3D=1 AND RE="T" then apply this filter as closed by @ENDFILTER" for the first @FILTER(Condition) of which condition = True is applied. 

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