"Grameenphone has discovered some errors related to regular commission payments for prior years. Due to the materiality of this effect, Grameenphone has chosen to restate their historical financials," Telenor said in a statement late on Sunday.

For Telenor, this would mean taking a one-off loss in the second quarter of 2019, with its expectations for earnings before interest, tax, debt and amortisation (EBITDA) lowered by 299 million crowns ($35.05 million).

Net profit guidance would be lowered by 622 million crowns ($72.91 million) in the quarter, Telenor added.

Telenor will publish its second-quarter results on Tuesday.