B-Tax: Info about voluntary paid B-tax send from the accounting system
Purpose: Send information to eTax about what amount of B-Tax that has been paid by the taxpayers making the data available for the final tax calculation.
    Every year about 1. Marts-  a ; (semicolon) delimited csv file is exported from the Economy system and imported into eTax - in the following format
    No headerline: BTAX; pnr; skattekom; Skatteår,  beløb; betalings ID;
 
    File encoding:UTF-8 
    If nothing else is mentioned, integers can be both positive and negative.
    Each field (in the following data lines) is in format:
	- BTAX: Constant text always the value of "BTAX"
 
    - Pnr : The CPR on the person (in the format XXXXXXXXXX where X is a digit between 
        0 and 9) (Text,  10 characters)
 
	- Skattekom: Tax Municipality number: (Integer, 2 digits, positive only) As of autum 2018 - This field has no significance and is ignored by eTax
 
    - Skatteår: Tax year (Integer, 4 digits, positive only).
 
	- Beløb: The amount of B-tax that the taxpayer has actually paid. (Integer, 10 digits positive)
 
	- Betalings ID: Unique id from the Economy system (XAL or Prisme. So far it is an Integer, 10 digits) 
        Remark: It is imperative that Prisme does not (by accident) reuse Uniq IDs from the XAL series.
        
The ID is used to check that a specific payment is imported once and only once 
    Examples file generated month of March 2016: 
    BTAX,010147xxxx,32,2015,121656,123456781;
    BTAX,310162xxxx,31,2015,11880,123456782;