How to do loading for 0FI_GL_4 by accounting document number?

Hi experts,

I want to enable the selection on field BELNR (Accounting Document Number) in datasource:0FI_GL_4.

As I need to run the infopackage by this field.

But I found in RSA6, I can't enable the selection for this field.

Do you know the reason, Any useful information is welcome.

Thank you in advance.