Product: ImportOmatic
Description: Can IOM automatically close open Declarations when importing in new ones? 
Environment: All
Version: All

Answer:

Yes. There is an option in an IOM profile to handle closing open declarations when importing in a new one. The option is under General Settings in each IOM profile. The checkbox says:

"When importing a tax declaration, set the end date on all open declarations to be one day earlier than the new declaration's start date"