How GTD table J_3RFGTDMAT is updated

Hello Experts,

Can someone explain me "How GTD table J_3RFGTDMAT is updated in SAP" as i am facing one issue due to this.

Issue : "We are getting extra line in the output of the invoice for Russia as per my initial analysis i can find there is multiple entries available in the table J_3RFGTDMAT for that line item.

so just want to know how exactly this table is updated and what is the root cause behind the multiple entries in table.

Kind Regards,

Aman