You can specify that OMI should run in simulation mode. In this mode, BOM nodes, node attributes, node descriptions, BOM positions, position attributes, and position document references are not created or updated (except for the NODE_MODIFIER record type, these records are always processed regardless of whether the mode is transfer or simulation).
All data validations that can be done without creating BOM data take place, and any data problems that OMI finds are written to the import log. This mode is a means for quickly checking if the format of the import file is correct or not. The transfer mode, on the other hand, is the default mode. It creates or updates BOM data from the import data, as described in the other sections of this help.