Account receiveable- line itm 0FI_AR_4

Hi,

i have a question. i'm working on 3.5 Bi,

when i check AR in infosource it is showing.

"Customers: Line Items (Extraction Linked to 0FI_GL_4))".

Plase some one explain me what is the meaning or purpose of "extraction linked to 0FI_GL_4".

i suppose it is independent of GL.

Please help me.

Thanks,

Pria.