Assign and Check Numbers 
The function modules in this group manage the number assignment.
NUMBER_CHECK
You need this function module for external number assignment. It checks whether a number range object number is within a specified number range interval.
NUMBER_GET_INFO
This function module getd information about a number range interval of a number range object.
NUMBER_GET_NEXT
You need this function module for external number assignment. It assigns the next free number(s) in a number range interval, to a number range object. When the last number in the interval has been assigned, number assignment starts again with the first number in the interval. The return code tells you whether the numbers assigned are in the critical range.