Index: trunk/src/libcschem/cnc_arc.c
===================================================================
--- trunk/src/libcschem/cnc_arc.c	(revision 2273)
+++ trunk/src/libcschem/cnc_arc.c	(revision 2274)
@@ -294,13 +294,13 @@
 	csch_arc_modify(sheet, arc, &ncx, &ncy, NULL, &nstart, &ndelta, undoable, 0);
 }
 
-static void arc_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable)
+static void arc_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *in, int undoable)
 {
-	csch_arc_t *arc = (csch_arc_t *)obj;
+	csch_arc_t *arc = (csch_arc_t *)in;
 	csch_coord_t cx = arc->inst.c.c.x, cy = arc->inst.c.c.y, r = arc->inst.c.r;
 	double start = arc->inst.c.start, delta = arc->inst.c.delta;
 
-	csch_arc_modify(sheet, arc, &cx, &cy, &r, &start, &delta, undoable, 0);
+	csch_arc_modify(sheet, (csch_arc_t *)obj, &cx, &cy, &r, &start, &delta, undoable, 0);
 }
 
 
Index: trunk/src/libcschem/cnc_line.c
===================================================================
--- trunk/src/libcschem/cnc_line.c	(revision 2273)
+++ trunk/src/libcschem/cnc_line.c	(revision 2274)
@@ -248,13 +248,13 @@
 }
 
 
-static void line_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable)
+static void line_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *in, int undoable)
 {
-	csch_line_t *line = (csch_line_t *)obj;
+	csch_line_t *line = (csch_line_t *)in;
 	csch_coord_t x1 = line->inst.c.p1.x, y1 = line->inst.c.p1.y;
 	csch_coord_t x2 = line->inst.c.p2.x, y2 = line->inst.c.p2.y;
 
-	csch_line_modify(sheet, line, &x1, &y1, &x2, &y2, undoable, 0);
+	csch_line_modify(sheet, (csch_line_t *)obj, &x1, &y1, &x2, &y2, undoable, 0);
 }
 
 const csch_ops_t csch_ops_line = {
Index: trunk/src/libcschem/cnc_text.c
===================================================================
--- trunk/src/libcschem/cnc_text.c	(revision 2273)
+++ trunk/src/libcschem/cnc_text.c	(revision 2274)
@@ -287,14 +287,14 @@
 	csch_text_modify(sheet, text, &x1, &y1, &x2, &y2, &nrot, NULL, NULL, NULL, NULL, undoable, 0);
 }
 
-static void text_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable)
+static void text_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *in, int undoable)
 {
-	csch_text_t *text = (csch_text_t *)obj;
+	csch_text_t *text = (csch_text_t *)in;
 	csch_coord_t x1 = text->inst1.x, y1 = text->inst1.y;
 	csch_coord_t x2 = text->inst2.x, y2 = text->inst2.y;
 	double rot = text->inst_rot;
 
-	csch_text_modify(sheet, text, &x1, &y1, &x2, &y2, &rot, NULL, NULL, NULL, NULL, undoable, 0);
+	csch_text_modify(sheet, (csch_text_t *)obj, &x1, &y1, &x2, &y2, &rot, NULL, NULL, NULL, NULL, undoable, 0);
 }
 
 const csch_ops_t csch_ops_text = {
Index: trunk/src/libcschem/operation.c
===================================================================
--- trunk/src/libcschem/operation.c	(revision 2273)
+++ trunk/src/libcschem/operation.c	(revision 2274)
@@ -175,12 +175,12 @@
 	}
 }
 
-void csch_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable)
+void csch_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *inst_from, int undoable)
 {
 	const csch_ops_t *op = csch_op_get(obj->type);
 	if ((op != NULL) && (op->inst2spec != NULL)) {
 		uundo_freeze_serial(&sheet->undo);
-		op->inst2spec(sheet, obj, undoable);
+		op->inst2spec(sheet, obj, inst_from, undoable);
 		uundo_unfreeze_serial(&sheet->undo);
 		uundo_inc_serial(&sheet->undo);
 	}
Index: trunk/src/libcschem/operation.h
===================================================================
--- trunk/src/libcschem/operation.h	(revision 2273)
+++ trunk/src/libcschem/operation.h	(revision 2274)
@@ -50,7 +50,7 @@
 	void (*rotate)(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t rcx, csch_coord_t rcy, double da, int undoable);
 	void (*rotate90)(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t rcx, csch_coord_t rcy, int n, int undoable);
 	void (*mirror)(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t mcx, csch_coord_t mcy, int mirx, int miry, int undoable);
-	void (*inst2spec)(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable);
+	void (*inst2spec)(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *in, int undoable);
 } csch_ops_t;
 
 
@@ -70,9 +70,9 @@
 void csch_move(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t dx, csch_coord_t dy, int undoable);
 void csch_copy(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t dx, csch_coord_t dy, int undoable);
 
-/* Copy inst (current final transformation) back to spec; this can be used
-   in a transformed group breakup to get all ex-member objects stay in place */
-void csch_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, int undoable);
+/* Copy inst (current final transformation) of inst_from to spec of obj; this
+   can be used in a transformed group breakup to get all ex-member objects stay in place. */
+void csch_inst2spec(csch_sheet_t *sheet, csch_chdr_t *obj, const csch_chdr_t *inst_from, int undoable);
 
 /* Undoably rotate object by da radians around rcx;rcy; the original spec is moved */
 void csch_rotate(csch_sheet_t *sheet, csch_chdr_t *obj, csch_coord_t rcx, csch_coord_t rcy, double da, int undoable);
Index: trunk/src/plugins/construct/breakup.c
===================================================================
--- trunk/src/plugins/construct/breakup.c	(revision 2273)
+++ trunk/src/plugins/construct/breakup.c	(revision 2274)
@@ -41,7 +41,7 @@
 	for(e = htip_first(&src->id2obj); e != NULL; e = htip_next(&src->id2obj, e)) {
 		csch_chdr_t *newo = csch_op_copy_into(sheet, dst, e->value);
 		if (newo != NULL)
-			csch_move(sheet, newo, src->x, src->y, 1);
+			csch_inst2spec(sheet, newo, e->value, 1);
 		else
 			res = -1;
 	}