diff --git a/src/main/scala/com/campudus/tableaux/arguments.scala b/src/main/scala/com/campudus/tableaux/arguments.scala
index 2d0646fe..e3dc4a38 100644
--- a/src/main/scala/com/campudus/tableaux/arguments.scala
+++ b/src/main/scala/com/campudus/tableaux/arguments.scala
@@ -109,27 +109,6 @@ object ArgumentChecker {
     }
   }
 
-  def isDefined(options: Seq[Option[_]], trys: Seq[Try[Option[_]]], name: String): ArgumentCheck[Unit] = {
-    val empty = !options.exists(_.isDefined)
-    val noneHaveBeenDefined = trys.forall(_.isFailure)
-
-    if (empty && noneHaveBeenDefined) {
-      FailArg(InvalidRequestException(s"None of these options has a (valid) value. ($name)"))
-    } else {
-      OkArg(())
-    }
-
-  }
-
-  def nullableValuesAreDefined(trys: Seq[Try[Option[_]]], name: String = ""): ArgumentCheck[Unit] = {
-    val allHaveBeenSupplied = trys.forall(_.isSuccess)
-    if (allHaveBeenSupplied) {
-      FailArg(InvalidRequestException(s"None of these options has a (valid) value. ($name)"))
-    } else {
-      OkArg(())
-    }
-  }
-
   def oneOf[A](x: => A, list: List[A], name: String): ArgumentCheck[A] = {
     if (list.contains(x)) {
       OkArg(x)
diff --git a/src/main/scala/com/campudus/tableaux/controller/StructureController.scala b/src/main/scala/com/campudus/tableaux/controller/StructureController.scala
index 4ec4a2e7..cac2502f 100644
--- a/src/main/scala/com/campudus/tableaux/controller/StructureController.scala
+++ b/src/main/scala/com/campudus/tableaux/controller/StructureController.scala
@@ -474,20 +474,16 @@ class StructureController(
           attributes,
           rules,
           hidden,
-          showMemberColumns
+          maxLength,
+          minLength,
+          showMemberColumns,
+          decimalDigits
         ),
-        Seq(maxLengthTry, minLengthTry),
-        "name, ordering, kind, identifier, displayInfos, countryCodes, separator, attributes, rules, hidden, maxLength, minLength, showMemberColumns"
+        "name, ordering, kind, identifier, displayInfos, countryCodes, separator, attributes, " +
+          "rules, hidden, maxLength, minLength, showMemberColumns, decimalDigits"
       )
     )
-    val maxLength = maxLengthTry match {
-      case Failure(exception) => None
-      case Success(opt) => opt
-    }
-    val minLength = minLengthTry match {
-      case Failure(exception) => None
-      case Success(opt) => opt
-    }
+
     val structureProperties: Seq[Option[Any]] = Seq(columnName, ordering, kind, identifier, countryCodes)
     val isAtLeastOneStructureProperty: Boolean = structureProperties.exists(_.isDefined)
 
@@ -514,7 +510,8 @@ class StructureController(
           hidden,
           maxLength,
           minLength,
-          showMemberColumns
+          showMemberColumns,
+          decimalDigits
         )
 
     for {
diff --git a/src/main/scala/com/campudus/tableaux/helper/JsonUtils.scala b/src/main/scala/com/campudus/tableaux/helper/JsonUtils.scala
index 38589d3f..02a0a986 100644
--- a/src/main/scala/com/campudus/tableaux/helper/JsonUtils.scala
+++ b/src/main/scala/com/campudus/tableaux/helper/JsonUtils.scala
@@ -323,11 +323,11 @@ object JsonUtils extends LazyLogging {
     } yield valueList
   }
 
-  private def getNullableJsonIntegerValue(key: String, json: JsonObject): Try[Option[Int]] = {
+  private def getNullableJsonIntegerValue(key: String, json: JsonObject): Try[Int] = {
     Try({
       json.containsKey(key) match {
         case false => throw new KeyNotFoundInJsonException(key)
-        case true => Option(json.getInteger(key)).map(_.toInt)
+        case true => json.getInteger(key)
       }
     })
   }
@@ -343,9 +343,10 @@ object JsonUtils extends LazyLogging {
       Option[JsonObject],
       Option[JsonArray],
       Option[Boolean],
-      Try[Option[Int]],
-      Try[Option[Int]],
-      Option[Boolean]
+      Option[Int],
+      Option[Int],
+      Option[Boolean],
+      Option[Int]
   ) = {
 
     val name = Try(notNull(json.getString("name"), "name").get).toOption
@@ -378,8 +379,9 @@ object JsonUtils extends LazyLogging {
       }
     ).map(_.asScala.toSeq.map({ case code: String => code }))
 
-    val maxLength = getNullableJsonIntegerValue("maxLength", json)
-    val minLength = getNullableJsonIntegerValue("minLength", json)
+    val maxLength = getNullableJsonIntegerValue("maxLength", json).toOption
+    val minLength = getNullableJsonIntegerValue("minLength", json).toOption
+    val decimalDigits = getNullableJsonIntegerValue("decimalDigits", json).toOption
 
     (
       name,
@@ -394,7 +396,8 @@ object JsonUtils extends LazyLogging {
       hidden,
       maxLength,
       minLength,
-      showMemberColumns
+      showMemberColumns,
+      decimalDigits
     )
   }