X selection is not allowed with the 'Y' action.
where X is item or key, and Y is clear,
new, REPEAT OVER, save or
or X selection is not allowed with the 'Y' condition.
where X is item or key, and Y is 'haskey.'
or X selection is not allowed in conjunction with 'NUMBER-OF'.
where X is item or key.
or The IS SPECIFIED attribute test cannot be combined with an ITEM
or The 'X' stream cannot be indexed with 'Y' selection.
where X is output, #output, or markup and Y is
item or key.
or The 'X' is a scalar shelf, and cannot be indexed.
where X is the name of a counter, stream, or switch.
Compilation continues but no compiled source code file will be saved.
The item phrase may be used only where it makes sense
to work with one particular value of the shelf rather than the complete
shelf. Only a complete shelf, not part of it, can be cleared, added to,
repeated over, or saved.