====== LookupGlobalKey ======

This function basically corresponds to the mapping function [[en:transformation:mappings:funktionen:abfragefunktionen:lookup:lookupglobalvalue|LookupGlobalValue]]. 
However, the key is queried for the value and LookupGlobalKey gets an additional //Key// and the //Key-Description//, as parameters which are used to create new table fields when the key is not found. 

==== Syntax: ====

<code>LookupGlobalKey('LookupTabellenNamen','Key', 'Description')</code>
<code>LookupGlobalKey('LookupTabellenNamen','Key', 'Description', 'Value', 'Description')</code>

==== Sanmple: ====

<code>LookupGlobalKey('currencies','5','Country code Switzerland')</code>
<code>LookupGlobalKey('currencies','5','Country code Switzerland', 'SFr', 'Currency Switzerland')</code>