Why do we need to know the flow of campaign funds?

Adian YY Napitupulu
member of the Indonesian House of Representatives for the period 2014–2019, then re-elected for the period 2019–2024
Adian Yunus Yusak Napitupulu (born January 9, 1971) is a politician and former activist from Indonesia who currently serves as a member of the People's Representative Council of the Republic of Indonesia (DPR RI) from the Indonesian Democratic Party of Struggle (PDIP) and represents the electoral district of West Java V since 2014. He is currently a member of Commission VII, which has duties in the fields of Industry, SMEs, Creative Economy, Tourism, and Public Facilities. In the 2019 election, Adian ran again in the same electoral district. In this district, Adian competed with the politician Fadli Zon from Gerindra Party. Based on the recapitulation of the KPU votes, Adian Napitupulu received 80,228 votes, which is below the votes obtained by Fadli Zon, who reached 230,524 votes. Source: Wikipedia