Index: layer.c
===================================================================
--- layer.c	(revision 19307)
+++ layer.c	(revision 19308)
@@ -842,10 +842,12 @@
 void pcb_layer_real2bound(pcb_layer_t *dst, pcb_layer_t *src, int share_rtrees)
 {
 	pcb_board_t *pcb;
+	pcb_layergrp_t *grp;
 
 	assert(!src->is_bound);
 
 	pcb = pcb_layer_get_top(src);
+	grp = pcb_get_layergrp(pcb, src->meta.real.grp);
 	dst->comb = src->comb;
 
 	dst->meta.bound.type = pcb_layergrp_flags(pcb, src->meta.real.grp);
@@ -854,6 +856,11 @@
 	else
 		dst->name = NULL;
 
+	if ((grp != NULL) && (grp->purpose != NULL))
+		dst->meta.bound.purpose = pcb_strdup(grp->purpose);
+	else
+		dst->meta.bound.purpose = NULL;
+
 	pcb_layer_real2bound_offs(dst, pcb, src);
 
 	if (!src->is_bound) {