Mapping help:how to suppress on filed value?

Hi all,

I have a requirement where i need to suppress one field value in mapping level.

GL                            Target Node

Gl_acc --filed               Char--field

If Gl_acc range is less than 39999 i need to pass empty value to Char filed and if Gl_acc=22123 then i need to suppress this GL_acc.

and I am able to do this less than 39999 condition but second condition I am not getting the logic how to suppress this 22123 value .

Please Help on this logic .

Regards

Umesh