Doubtful receivables are outstanding receivables from debtors for which there is uncertainty as to whether and to what extent they can actually be collected. In contrast to clearly irrecoverable requirements Although there is a default risk here, payment default is not yet certain.
Management and definition in SAP Business One:
Doubtful debts are defined in SAP Business One in the menu under:

Administration → Definition → Finance → Doubtful receivables
Here you can specify from which point in time (number of days since the due date) and at what percentage receivables are automatically categorised as doubtful.
Example: Setting "0 days and 2%" means that 2% of all outstanding receivables are considered to be doubtful on the reporting date.
It is important that these definitions are in line with the applicable statutory provisions on the accounting and evaluation must be carried out.
Value adjustment and posting:
The actual posting of the value adjustment is not carried out automatically by the system, but must be carried out manually via a journal adjustment posting. This usually results in a reduction in receivables recognised in profit or loss, which is reflected accordingly in the income statement.
Identification and reporting:
Doubtful debts are relevant for internal and external reporting. They are recognised in the Account reconciliation and in periodic reports and must be reviewed regularly in order to present the company's default risk transparently and realistically.
Versino Financial Suite
the Versino Financial Suite für SAP Business One bringt klare Vorteile im Umgang mit zweifelhaften Forderungen: Sie verbessert die Transparenz über das Zahlungsverhalten, erkennt Risiken frühzeitig und erleichtert die Planung sowie Buchung von Wertberichtigungen. Durch erweiterte Berichte unterstützt die Versino Financial Suite die interne Kontrolle und externe Berichterstattung, wodurch das Forderungsausfallrisiko besser gesteuert und die Finanzprozesse effizienter gestaltet werden können.