diff --git a/lib/plugins.js b/lib/plugins.js
index 139a6a34..9e8ba945 100644
--- a/lib/plugins.js
+++ b/lib/plugins.js
@@ -126,18 +126,6 @@ function plugins (settings, deviceId) {
     ]
   }
 
-  function getLcmOrBigx2 (n1, n2) {
-    let big = Math.max(n1, n2);
-    let small = Math.min(n1, n2);
-    
-    let i = big * 2;
-    while(i % small !== 0){
-      i += lar;
-    }
-    
-    return i;
-  }
-
   function buildAvailableCassettes (excludeTxId) {
     const cashOutConfig = configManager.getCashOut(deviceId, settings.config)
 
@@ -145,7 +133,7 @@ function plugins (settings, deviceId) {
 
     const denominations = [cashOutConfig.top, cashOutConfig.bottom]
 
-    const virtualCassettes = [getLcmOrBigx2(cashOutConfig.top, cashOutConfig.bottom)]
+    const virtualCassettes = [Math.max(cashOutConfig.top, cashOutConfig.bottom) * 2]
 
     return Promise.all([dbm.cassetteCounts(deviceId), cashOutHelper.redeemableTxs(deviceId, excludeTxId)])
       .then(([rec, _redeemableTxs]) => {
diff --git a/new-lamassu-admin/src/pages/Cashout/helper.js b/new-lamassu-admin/src/pages/Cashout/helper.js
index 2567f9d8..314985c7 100644
--- a/new-lamassu-admin/src/pages/Cashout/helper.js
+++ b/new-lamassu-admin/src/pages/Cashout/helper.js
@@ -7,12 +7,12 @@ const DenominationsSchema = Yup.object().shape({
   top: Yup.number()
     .label('Cassette 1 (Top)')
     .required()
-    .min(0)
+    .min(1)
     .max(currencyMax),
   bottom: Yup.number()
     .label('Cassette 2 (Bottom)')
     .required()
-    .min(0)
+    .min(1)
     .max(currencyMax),
   zeroConfLimit: Yup.number()
     .label('0-conf Limit')