Is there a way to use <validator> or perhaps <filter> options to avoid the 
selection of the same dataset twice in different parameters of a tool.

E.g. a tool has 2 "data" type parameters of the same type, but it should not be 
possible for the user to set both parameters to the same dataset. So if his 
history contains files A,B, and C and he selects A in his first parameter, then 
the second parameter should display only the options B and C.

Thanks and regards,

Pieter Lukasse
Wageningen UR, Plant Research International
Departments of Bioscience and Bioinformatics
Wageningen Campus, Building 107, Droevendaalsesteeg 1, 6708 PB,
Wageningen, the Netherlands
+31-317480891; skype: pieter.lukasse.wur

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