Index: trunk/src/libcschem/abstract.c
===================================================================
--- trunk/src/libcschem/abstract.c	(revision 3292)
+++ trunk/src/libcschem/abstract.c	(revision 3293)
@@ -36,6 +36,7 @@
 void csch_ahdr_uninit(csch_ahdr_t *hdr)
 {
 	csch_attrib_uninit(&hdr->attr);
+	vtp0_uninit(&hdr->srcs);
 }
 
 void csch_anet_free_fields(csch_anet_t *net)
Index: trunk/src/libcschem/abstract.h
===================================================================
--- trunk/src/libcschem/abstract.h	(revision 3292)
+++ trunk/src/libcschem/abstract.h	(revision 3293)
@@ -65,6 +65,7 @@
 	csch_atype_t type;
 	csch_attribs_t attr;
 	long aid;
+	vtp0_t srcs;              /* list of pointers to concrete objects that were source to this abstract object */
 	csch_abstract_t *abst;
 };
 
Index: trunk/src/libcschem/compile.c
===================================================================
--- trunk/src/libcschem/compile.c	(revision 3292)
+++ trunk/src/libcschem/compile.c	(revision 3293)
@@ -47,6 +47,7 @@
 csch_inline void compile_add_source(csch_cgrp_t *src, csch_ahdr_t *abst)
 {
 	vtl0_append(&src->aid, abst->aid);
+	vtp0_append(&abst->srcs, src);
 }
 
 static int compile_attributes(csch_ahdr_t *dst, const csch_attribs_t *src)