It is possible that a Testing Authority (TA) has contracted the analysis of the sample to two different Laboratories, for example lab A performs the routine analysis whereas Lab B carries out the more sophisticated IRMS analysis.
The TA has to make sure to manually add the two samples with the same sample code/type as 2 separate elements in the DCF, each associated with the appropriate Lab. For the sake of completeness the TA has to repeat this for the Test-record as well (to add the second Lab in the Analysis tab).
Should the DCF with one sample already be matched with the Lab result entered by Lab A, then the TA should simply add the second sample in the DCF. If the second lab result reported by Lab B already existed in ADAMS, the Lab should simply re-submit the result (without modifying anything).