Using the following message I would expect two SPM segment after parsing.

MSH|^&|xxxx|homxtest_9||homxtest_9|20160205112211||OML^O33|000500006894|P|2.5|||NE|AL||8859/15
PID|1||1234567^^^Firstnamelastname^^^Firstname||Lastname&&Lastname^Firstname^B L J^^^^L||19991231|M|||Firstname^37^BE^^1234AB^nl|||||||||||||Y||||||N
SPM|1|1602050005&xxxx||EDTA^Paarse dop^xxxx||||||||3^ml&ml&xxxx|||||20160205111800|||N|||||||01^01^xxxx^paars^01
ORC|NW|1602-0006^xxxx|||IP||^^^20160205111800^^R||20160205112211||||^^^^^^^^^^xxxx
OBR|1|1602-0006^xxxx||Na^Natrium^xxxx|||20160421114000||0^ml&ml&xxxx||||||EDTA^Paarse dop&xxxx|||||||20160205112211||A|I||^^^20160205111800^^S
SPM|2|1602050004&xxxx||Citrate^Blauwe dop^xxxx||||||||0^ml&ml&xxxx|||||20160205111800|||N|||||||08^08^xxxx^blauw^08
ORC|NW|1602-0006^xxxx|||IP||^^^20160205111800^^R||20160205112211||||^^^^^^^^^^xxxx
OBR|2|1602-0006^xxxx||Na^Natrium^xxxx|||20160421114000||0^ml&ml&xxxx||||||Citrate^Blauwe dop&xxx|||||||20160205112211||A|I||^^^20160205111800^^S

As a result I get only 1 SPM segment. When looking at the source in PipeParser.cs in function DoParse it seems to override the previously created SPM segment.

Using version 2.5.0.5 nuget.