If a target attribute has more than one attribute mapping, filters gets no unrolled to all the source expressions

There might be multiple mappings per property name, like
gml:name[1] = att1
gml:name2 = strConcat(att2, att3)
gml:name[3] = "sampleValue"

In the BoreHole test mapping used here, the following mappings exist for
gml:name:

gml:name[1] = strConcat( strConcat(QS, strConcat("/", RT)), strConcat(strConcat("/", NUMB), strConcat("/", BSUFF)) )
gml:name[2] = BGS_ID
gml:name[3] = NAME
gml:name[4] = ORIGINAL_N

This means the "unrolled" filter for a filter over the target schema like
gml:name = "SWADLINCOTE" should be

 strConcat( strConcat(QS, ...) = "SWADLINCOTE" 
          OR BGS_ID = "SWADLINCOTE" 
          OR NAME = "SWADLINCOTE" 
          OR ORIGINAL_N = "SWADLINCOTE"