I want to add a conditional range summation equation, which has two conditional statements as mentioned below:

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```
Con23(bus)..
sum (node $ ( conex(bus,node) and (node>bus) ) ,lambda(bus,node)/branch(bus,node,'x') =e= 0 ;
```

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`conex(bus,node)`

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`(node>bus)`

"dimension different: the symbol is referenced with more/less indices as declared."

It is worth mentioning both "bus" and "node" sets are exactly equal, and I don't know which indices are more/less.