====== GetTradingPartnerTNr ======

This function can be executed without parameters, only by means of //running job/// and takes the //TNr// of the //TradingPartners// from the //Data// of the //Document object. // Otherwise, a GLN can simply be passed to the function, for which the corresponding TNr is returned. 

==== Syntax: ====

<code>GetTradingPartnerTNr('GLN')</code>
<code>GetTradingPartnerTNr()</code>
get the trading partner's TNr of the current message

==== Sample: ====

<code>GetTradingPartnerTNr('4043077000005')</code>