diff --git a/canvas b/canvas
index 29fdc5a..6f1cda3 160000
--- a/canvas
+++ b/canvas
@@ -1 +1 @@
-Subproject commit 29fdc5a6c73d4d5950123cf1be783b6ba5a5a917
+Subproject commit 6f1cda36d86f689fc03fd9978f3259d9a79a80b7
diff --git a/common/build.rs b/common/build.rs
index 2440bb0..cbc3634 100644
--- a/common/build.rs
+++ b/common/build.rs
@@ -20,6 +20,18 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
             ".komp_ac.table_validation.TableValidationResponse",
             "#[derive(serde::Serialize, serde::Deserialize)]",
         )
+        .type_attribute(
+            ".komp_ac.table_validation.PatternRule",
+            "#[derive(serde::Serialize, serde::Deserialize)]",
+        )
+        .type_attribute(
+            ".komp_ac.table_validation.PatternRules",
+            "#[derive(serde::Serialize, serde::Deserialize)]",
+        )
+        .type_attribute(
+            ".komp_ac.table_validation.CustomFormatter",
+            "#[derive(serde::Serialize, serde::Deserialize)]",
+        )
         .type_attribute(
             ".komp_ac.table_validation.UpdateFieldValidationRequest",
             "#[derive(serde::Serialize, serde::Deserialize)]",
diff --git a/common/src/proto/descriptor.bin b/common/src/proto/descriptor.bin
index a093404..62c30d1 100644
Binary files a/common/src/proto/descriptor.bin and b/common/src/proto/descriptor.bin differ
diff --git a/common/src/proto/komp_ac.table_validation.rs b/common/src/proto/komp_ac.table_validation.rs
index dbd6ba4..befe58c 100644
--- a/common/src/proto/komp_ac.table_validation.rs
+++ b/common/src/proto/komp_ac.table_validation.rs
@@ -26,7 +26,13 @@ pub struct FieldValidation {
     #[prost(message, optional, tag = "10")]
     pub limits: ::core::option::Option<CharacterLimits>,
     /// Future expansion:
-    /// PatternRules pattern = 11;
+    ///
+    /// Validation 2
+    #[prost(message, optional, tag = "11")]
+    pub pattern: ::core::option::Option<PatternRules>,
+    /// Validation 4 – custom formatting logic
+    #[prost(message, optional, tag = "14")]
+    pub formatter: ::core::option::Option<CustomFormatter>,
     #[prost(message, optional, tag = "3")]
     pub mask: ::core::option::Option<DisplayMask>,
     /// ExternalValidation external = 13;
@@ -65,6 +71,46 @@ pub struct DisplayMask {
     #[prost(string, optional, tag = "3")]
     pub template_char: ::core::option::Option<::prost::alloc::string::String>,
 }
+/// One position‑based validation rule, similar to CharacterFilter + PositionRange
+#[derive(serde::Serialize, serde::Deserialize)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct PatternRule {
+    /// Range descriptor: how far the rule applies
+    /// Examples:
+    ///   - "0"        → Single position 0
+    ///   - "0-3"      → Range 0..3 inclusive
+    ///   - "from:5"   → From position 5 onward
+    ///   - "0,2,5"    → Multiple discrete positions
+    #[prost(string, tag = "1")]
+    pub range: ::prost::alloc::string::String,
+    /// Character filter type, case‑insensitive keywords:
+    /// "ALPHABETIC", "NUMERIC", "ALPHANUMERIC",
+    /// "ONEOF(<chars>)", "EXACT(:)", "CUSTOM(<name>)"
+    #[prost(string, tag = "2")]
+    pub filter: ::prost::alloc::string::String,
+}
+#[derive(serde::Serialize, serde::Deserialize)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CustomFormatter {
+    /// Formatter type identifier; handled client‑side.
+    /// Examples: "PSCFormatter", "PhoneFormatter", "CreditCardFormatter", "DateFormatter"
+    #[prost(string, tag = "1")]
+    pub r#type: ::prost::alloc::string::String,
+    /// Optional free‑text note or parameters (e.g. locale, pattern)
+    #[prost(string, optional, tag = "2")]
+    pub description: ::core::option::Option<::prost::alloc::string::String>,
+}
+/// Collection of pattern rules for one field
+#[derive(serde::Serialize, serde::Deserialize)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct PatternRules {
+    /// All rules that make up the validation logic
+    #[prost(message, repeated, tag = "1")]
+    pub rules: ::prost::alloc::vec::Vec<PatternRule>,
+    /// Optional human‑readable description for UI/debug purposes
+    #[prost(string, optional, tag = "2")]
+    pub description: ::core::option::Option<::prost::alloc::string::String>,
+}
 #[derive(serde::Serialize, serde::Deserialize)]
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct UpdateFieldValidationRequest {