SRSTAT returns Sampling Requirement statistics (count of results, percent complete...) for a sampling Requirement ID/Name.
SRSTAT(ID/Name, Stat, ForDate)
ID/Name: The ID (SAMPLEREQ.ID field) or the Sampling Requirement name in quotes. Can be a number (i.e. 12), a cell reference (i.e. C2) to a cell that contains a number or string or a quoted string that is a Sample Requirement Name.
Stat: The field to get:
ForDate: The function by default looks up the Sampling Requirement for the Start Date of the report. A date string (i.e. "07/16/2014") or reference to a cell with a date in it, the sampling requirement will be used for this date.