Warning in log - why?

[fre]

Dear community

In one of my programs, I do a conversion from numeric to text.  This is my code:

data test ;
format CD_YEAR $4.;
format CD_KD $3.;


set test0;

CD_YEAR = put(jr,$4.);
CD_KD = put(kd,$3.);


run;

What I don't understand is that my log gives the following warnings:

WARNING: Variable jr has already been defined as numeric.

WARNING: Variable kd has already been defined as numeric.

I know jr and kd are numeric, that's why I want to convert them to text...

What is happening here and how can I prevent such warnings?

[Haikuo · Accepted solution]

CD_YEAR = put(jr,4.);
CD_KD = put(kd,3.);

[fre]

Thank you for your help.  It's clear now.

[Kurt_Bremser]

What @Haikuo said. You erroneously used a character format for a numeric variable.