diff --git a/addons/l10n_ch/dta/dta_wizard.py b/addons/l10n_ch/dta/dta_wizard.py
index 094a7d7635c..14aab5c4c9d 100644
--- a/addons/l10n_ch/dta/dta_wizard.py
+++ b/addons/l10n_ch/dta/dta_wizard.py
@@ -483,7 +483,7 @@ def _create_dta(self,cr,uid,data,context):
 		v['invoice_reference']= i.reference
 		v['invoice_bvr_num']= i.bvr_ref_num
 		if v['invoice_bvr_num']:
-			v['invoice_bvr_num'] = v['invoice_bvr_num'].rjust(27,'0')
+			v['invoice_bvr_num'] = v['invoice_bvr_num'].replace(' ', '').rjust(27).replace(' ','0')
 			
 		v['partner_comment']= i.partner_comment