diff --git a/database/migrations/2020_09_14_130855_add_ei_edo_epo_to_invoice.php b/database/migrations/2020_09_14_130855_add_ei_edo_epo_to_invoice.php
index 5030f0d1..06804003 100644
--- a/database/migrations/2020_09_14_130855_add_ei_edo_epo_to_invoice.php
+++ b/database/migrations/2020_09_14_130855_add_ei_edo_epo_to_invoice.php
@@ -14,8 +14,8 @@ class AddEiEdoEpoToInvoice extends Migration
     public function up()
     {
         Schema::table('invoices', function (Blueprint $table) {
-            $table->string('edo')->unique();
-            $table->string('ei')->unique();
+            $table->string('edo');
+            $table->string('ei');
         });
     }
 
@@ -27,7 +27,7 @@ class AddEiEdoEpoToInvoice extends Migration
     public function down()
     {
         Schema::table('invoices', function (Blueprint $table) {
-            //
+            $table->dropColumn(['edo', 'ei']);
         });
     }
 }
diff --git a/database/migrations/2020_09_14_132221_add_default_null_to_edo_ei_and_nullable.php b/database/migrations/2020_09_14_132221_add_default_null_to_edo_ei_and_nullable.php
new file mode 100644
index 00000000..b1e4367e
--- /dev/null
+++ b/database/migrations/2020_09_14_132221_add_default_null_to_edo_ei_and_nullable.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class AddDefaultNullToEdoEiAndNullable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->string('edo')->default(null)->nullable()->change();
+            $table->string('ei')->default(null)->nullable()->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            //
+        });
+    }
+}
diff --git a/database/migrations/2020_09_14_133932_remove_edo_ei.php b/database/migrations/2020_09_14_133932_remove_edo_ei.php
new file mode 100644
index 00000000..b2d70fe3
--- /dev/null
+++ b/database/migrations/2020_09_14_133932_remove_edo_ei.php
@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class RemoveEdoEi extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->dropColumn(['edo', 'ei']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            //
+        });
+    }
+}
diff --git a/database/migrations/2020_09_14_134204_create_edo_ei.php b/database/migrations/2020_09_14_134204_create_edo_ei.php
new file mode 100644
index 00000000..81ee1127
--- /dev/null
+++ b/database/migrations/2020_09_14_134204_create_edo_ei.php
@@ -0,0 +1,33 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateEdoEi extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            $table->string('ei')->default(null)->nullable()->unique();
+            $table->string('edo')->default(null)->nullable()->unique();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('invoices', function (Blueprint $table) {
+            //
+        });
+    }
+}