path	value/explanation	url	count
invalid value (4 variant(s))			4
006/16 (006book16)	" "		1
006/12 (006book12)	" "		1
006/13 (006book13)	" "		1
006/14 (006book14)	" "		1
repetition of non-repeatable subfield (1 variant(s))			1
654$2	there are multiple instances		1