26. Is there a ban on donors to political parties/candidates participating in public tender/procurement processes?

Source: 

Article 8, Law on Political Party Financing  2012 (with 2016 amendments)

(BS)

[...] (4) Privatna preduzeća koja su s organima izvršne vlasti na svim nivoima u Bosni i Hercegovini sklopila ugovor o javnoj nabavci usluga, ugovor o javnoj nabavci robe ili ugovor o javnoj nabavci radova, u skladu s propisima o javnim nabavkama u Bosni i Hercegovini, ne 
mogu finansijski pomagati političke stranke ako vrijednost ugovora u jednoj kalendarskoj godini prelazi iznos od 10.000,00 KM (deset hiljada konvertibilnih maraka).  [...]

(EN)

[...] (4) Private companies that have concluded a public procurement contract for services, goods, or works with executive authorities at any level in Bosnia and Herzegovina, in accordance with public procurement regulations in Bosnia and Herzegovina, may not provide financial support to political parties if the value of the contract in a single calendar year exceeds 10,000 KM (ten thousand convertible marks). [...]

Avaliable at: https://www.izbori.ba/Documents/documents/ZAKONI/Fin_Stranaka/DOC039-bos.PDF

There is no ban on donors to political parties/candidates participating in public tender/procurement processes, only a limit on their donations.

"Private companies that have concluded a public procurement contract for services, goods, or works with executive authorities at any level in Bosnia and Herzegovina, in accordance with public procurement regulations in Bosnia and Herzegovina, may not provide financial support to political parties if the value of the contract in a single calendar year exceeds 10,000 KM (ten thousand convertible marks)."