Description variables (version 5 - version 6)

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Hi !

Described variables preliminary
More Comfortable !!!!!!!!!!!!!!

Version 5 - worked perfectly
/*
&
&
*/

select To_Date('&YEAR-&MONTH-01','YYYY-MM-DD')-1 DAY from DUAL

Version 6 - ignores description

Now it is correct ?

Thank You !!!!!!!!!