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This function will read the value of a number field on a received form.
Note that the received form is only valid after a "Form received" event is raised; the event will not be removed until the navFormReceiveDone function is called.
id : DINT (1..2147483647)
ID of the field to read.
number : DINT
The value of the field.
FUNCTION navFormReceiveReadNumber : INT;