The FAQs page in the Koha manual spells out many of the available statuses, but there's none for accountline statuses. It would be helpful for reporting to know what statuses are available and what they mean for reporting.
Thanks for logging this one Hebah! The Documentation team has agreed to move the FAQs into more relevant sections and to eventually remove this page if possible (because things there get forgotten and are not so easily kept up-to-date). Anyone documenting this should consider adding the statuses to another page than FAQs.