[rules-users] Unable to create restriction '[QualifiedIndentifierRestr: != $nissan.pos ]' for field 'pos' , in the rule 'Racing order'

[Marcin Krol]

Hello everyone,

The same problem regards the "golfing example" from examples project. 
Adding nearly any restrictions, e.g. this one:

                 position != $tom.position,


in rules for Bob:

  		// Bob is wearing plaid pants
         $bob : Golfer( name == "Bob",
                 position != $fred.position,
                 position != $joe.position,
                 position != $tom.position,
                 color == "plaid",
                 color != $fred.color,
                 color != $joe.color )


produces an error:

find solution:Unable to create restriction '[QualifiedIndentifierRestr: 
!= $tom.position ]' for field 'position' in the rule 'find solution'


How to resolve this?