diff --git a/read_config b/read_config
index 2f06c29..2fd9c0c 100755
--- a/read_config
+++ b/read_config
@@ -146,8 +146,8 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
         # TODO
         # TODO: falls mehrere gruppen/zonen auftauchen hier anpassen
         # TODO
-        readonly local __zone=1
-        readonly CUSTOMER_BASE_DIR="${CUSTOMER_BASE_DIRS[$__zone]}"
+        readonly ZONE=1
+        readonly CUSTOMER_BASE_DIR="${CUSTOMER_BASE_DIRS[$ZONE]}"
         if [ -d "$CUSTOMER_BASE_DIR" ]; then
             log_debug "$func:${LINENO}: CUSTOMER-BASE-DIR="
             log_debug "$func:${LINENO}:      $CUSTOMER_BASE_DIR"
@@ -209,6 +209,15 @@ if [ ${read_config_sourced:-1} = "1" ]; then    # include only once
             log_fatal "$func:${LINENO}: $psa_atbqt_dir does not exist"
         fi
 
+        readonly TARIFF_CURRENT="tariff.current"
+        readonly TARIFF_CURRENT_FULL="${psa_atbqt_dir}/$TARIFF_CURRENT"
+        if [ -f "$TARIFF_CURRENT_FULL" ]; then
+            log_debug "$func:${LINENO}: tariff.current="
+            log_debug "$func:${LINENO}:      $TARIFF_CURRENT_FULL"
+        else
+            log_fatal "$func:${LINENO}: $TARIFF_CURRENT_FULL does not exist"
+        fi
+
         readonly ATBQT_INI="ATBQT.ini"
         readonly ATBQT_INI_FULL="${psa_atbqt_dir}/$ATBQT_INI"
         if [ -f "$ATBQT_INI_FULL" ]; then