Dynamics 365 F/SC has PurchLine.LineNumber field typed as Int64 hence it should allow to enter field line values greater than regular integer type top positive value (2 147 483 647). While attempting to do so in our integration project, we have encountered obstacle on the Accounting distributions functionality level which seemed to assume that source document line numbers should be convertible to regular int value (int642int() global function explicitly used in source document framework’s code).

Although the case is not a blocker any more thanks to applied workaround (it had been reported through Issue portal (SR #2208010010002330)) there is a sense that addressing it in a permament way, i.e. by developing solution allowing source document framwork to handle line numbers of type int64, would remove the mentioned potential inconsistency in system's arhcitecture.