The most common transactions in 1C are making a posting (entering a document into the system), exchanging data and editing them, as well as generating reports.
In the 1C system, nesting transactions one into another is not supported, which means that only one transaction is always executed - the highest level. For example, if a teller wants to undo changes in one of the open transactions, the system will roll back changes only at the top level.
And vice versa - an attempt to commit such changes will be ignored by the system.