--STRESU standardized result units - same value accross one domain?

Hello all,

SEND specs allows you to specify some numeric results (e.g. for weighings) in both "collected" and "standardized" form, where:

a) the "collected" form is "Result of the measurement or finding as originally received or collected." (--ORRES and --ORRESU variables);

b) the "standardized" form is the "the result value for all findings or derived from ORRES in a standard format or standard units" (--STRESC, --STRESN, --STRESU variables).

SEND specs also say that the sponsor might choose the "standard unit" to be used for the standardized variables: --STRESC, --STRESN, --STRESU. And this unit should be used consistently accross each domain.

What I understand from this is that:

- --ORRESU can have various values into the same dataset; e.g. BWORRES in BW.xpt for one study can contain both "g" and "kg" values, for distinct rows;

- --STRESU must have the same values in the entire dataset; e.g. if BWSTRESU in BW.xpt for one study contains both "g" and "kg" values - we might have a problem, since we are not using the same unit of measure for the "standardized" result.

My questions are:

- Is my understanding of the problem correct? Or we are not bound to use just one standardized unit for --STRESU?

- If so - shouldn't the validator implement such a rule?

Thanks!

Amelia