Smartform print symbol issue

Hi ABAP experts,

There is a Smartform in Quality system, and it can normal display the symbol ℃ (degree centigrade). But when the TRs transporte Production system, the symbol ℃ (degree centigrade) cannot be displayed, it becomes symbol ##. The example as following:

Smartform in Quality system:

Smartform in Production system:

Could you please give me some advises to solve this issue? Thank you.

Regards,

Steve