diff --git a/modules/chain/dap_chain_ledger.c b/modules/chain/dap_chain_ledger.c
index b5d60c54813907f913f15a1b99eaf05a86dd377c..4beffb11864342c0209529190581ac6f85a8c69f 100644
--- a/modules/chain/dap_chain_ledger.c
+++ b/modules/chain/dap_chain_ledger.c
@@ -102,7 +102,8 @@ static const char *s_ledger_tx_check_err_str[] = {
     [DAP_CHAIN_LEDGER_TX_CACHE_VERIFICATOR_CHECK_FAILURE] = "DAP_CHAIN_LEDGER_TX_CACHE_VERIFICATOR_CHECK_FAILURE",
     [DAP_CHAIN_LEDGER_TX_CACHE_CHECK_PREV_TICKER_NOT_FOUND] = "DAP_CHAIN_LEDGER_TX_CACHE_CHECK_PREV_TICKER_NOT_FOUND",
     [DAP_CHAIN_LEDGER_TX_CACHE_CHECK_PREV_TOKEN_NOT_FOUND] = "DAP_CHAIN_LEDGER_TX_CACHE_CHECK_PREV_TOKEN_NOT_FOUND",
-    [DAP_CHAIN_LEDGER_PERMISSION_CHECK_FAILED] = "DAP_CHAIN_LEDGER_PERMISSION_CHECK_FAILED"
+    [DAP_CHAIN_LEDGER_PERMISSION_CHECK_FAILED] = "DAP_CHAIN_LEDGER_PERMISSION_CHECK_FAILED",
+    [DAP_CHAIN_LEDGER_TX_CACHE_CHECK_SUM_INS_NOT_EQUAL_SUM_OUTS] = "DAP_CHAIN_LEDGER_TX_CACHE_CHECK_SUM_INS_NOT_EQUAL_SUM_OUTS"
 };
 
 static const char *s_ledger_emission_add_err_str[] = {
@@ -4208,7 +4209,7 @@ int dap_chain_ledger_tx_cache_check(dap_ledger_t *a_ledger, dap_chain_datum_tx_t
                     DAP_DELETE(l_balance);
                     DAP_DELETE(l_balance_cur);
                 }
-                l_err_num = -12;
+                l_err_num = DAP_CHAIN_LEDGER_TX_CACHE_CHECK_SUM_INS_NOT_EQUAL_SUM_OUTS;
                 break;
             }
         }
diff --git a/modules/chain/include/dap_chain_ledger.h b/modules/chain/include/dap_chain_ledger.h
index 304d8523d306676355eb25534afe0b5e857c6713..5b4e11f4f511733763a736706e9ada35705e9d8f 100644
--- a/modules/chain/include/dap_chain_ledger.h
+++ b/modules/chain/include/dap_chain_ledger.h
@@ -76,6 +76,7 @@ typedef enum dap_chain_ledger_tx_check{
     DAP_CHAIN_LEDGER_TX_CACHE_CHECK_PREV_TICKER_NOT_FOUND,
     DAP_CHAIN_LEDGER_TX_CACHE_CHECK_PREV_TOKEN_NOT_FOUND,
     DAP_CHAIN_LEDGER_PERMISSION_CHECK_FAILED,
+    DAP_CHAIN_LEDGER_TX_CACHE_CHECK_SUM_INS_NOT_EQUAL_SUM_OUTS,
     /* add custom codes here */
 
     DAP_CHAIN_LEDGER_TX_CHECK_UNKNOWN /* MAX */
diff --git a/modules/service/xchange/dap_chain_net_srv_xchange.c b/modules/service/xchange/dap_chain_net_srv_xchange.c
index b88b015205c4617e3d39b5dfbeff61e157601531..83315833c2f6abe33fb4969dd3704f7c29587c67 100644
--- a/modules/service/xchange/dap_chain_net_srv_xchange.c
+++ b/modules/service/xchange/dap_chain_net_srv_xchange.c
@@ -96,7 +96,7 @@ int dap_chain_net_srv_xchange_init()
     "srv_xchange orders -net <net_name>\n"
          "\tGet the exchange orders list within specified net name\n"
 
-    "srv_xchange purchase -order <order hash> -net <net_name> -wallet <wallet_name> -coins <value>\n"
+    "srv_xchange purchase -order <order hash> -net <net_name> -wallet <wallet_name> -value <value> -fee <value>\n"
          "\tExchange tokens with specified order within specified net name. Specify how many datoshies to sell with rate specified by order\n"
 
     "srv_xchange tx_list -net <net_name> [-time_from <yymmdd> -time_to <yymmdd>]"
@@ -404,7 +404,6 @@ static dap_chain_datum_tx_t *s_xchange_tx_create_request(dap_chain_net_srv_xchan
     if (!l_single_channel) {
         // add 'in' items to fee
         uint256_t l_value_fee_items = dap_chain_datum_tx_add_in_item_list(&l_tx, l_list_fee_out);
-        dap_list_free_full(l_list_used_out, NULL);
         if (!EQUAL_256(l_value_fee_items, l_fee_transfer) != 0) {
             dap_chain_datum_tx_delete(l_tx);
             DAP_DELETE(l_seller_addr);
@@ -656,14 +655,14 @@ static dap_chain_datum_tx_t *s_xchange_tx_create_exchange(dap_chain_net_srv_xcha
     }
     debug_if(s_debug_more, L_NOTICE, "l_datoshi_buy = %s", dap_chain_balance_to_coins(l_datoshi_buy));
     // transfer validator's fee
-    if (!IS_ZERO_256(a_price->fee)) {
-        if (dap_chain_datum_tx_add_fee_item(&l_tx, a_price->fee) == -1) {
+    if (!IS_ZERO_256(a_datoshi_fee)) {
+        if (dap_chain_datum_tx_add_fee_item(&l_tx, a_datoshi_fee) == -1) {
             dap_chain_datum_tx_delete(l_tx);
             DAP_DELETE(l_buyer_addr);
             log_it(L_ERROR, "Can't add validator fee output");
             return NULL;
         }
-        debug_if(s_debug_more, L_NOTICE, "l_validator_fee = %s", dap_chain_balance_to_coins(a_price->fee));
+        debug_if(s_debug_more, L_NOTICE, "l_validator_fee = %s", dap_chain_balance_to_coins(a_datoshi_fee));
     }
     // transfer net fee
     if (l_net_fee_used) {
@@ -701,7 +700,7 @@ static dap_chain_datum_tx_t *s_xchange_tx_create_exchange(dap_chain_net_srv_xcha
     if (!l_pay_with_native) {
         SUBTRACT_256_256(l_fee_transfer, l_total_fee, &l_value_back);
         if (!IS_ZERO_256(l_value_back)) {
-            if (dap_chain_datum_tx_add_out_ext_item(&l_tx, l_buyer_addr, l_value_back, a_price->token_buy) == -1) {
+            if (dap_chain_datum_tx_add_out_ext_item(&l_tx, l_buyer_addr, l_value_back, l_native_ticker) == -1) {
                 dap_chain_datum_tx_delete(l_tx);
                 DAP_DELETE(l_buyer_addr);
                 log_it(L_ERROR, "Can't add buying coins back output");