diff --git a/RIGS/migrations/0035_auto_20191008_2148.py b/RIGS/migrations/0035_auto_20191008_2148.py
new file mode 100644
index 00000000..756ceac5
--- /dev/null
+++ b/RIGS/migrations/0035_auto_20191008_2148.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.0.13 on 2019-10-08 20:48
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('RIGS', '0034_event_risk_assessment_edit_url'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='event',
+            name='risk_assessment_edit_url',
+            field=models.CharField(blank=True, max_length=255, null=True, verbose_name='risk assessment'),
+        ),
+    ]
diff --git a/assets/forms.py b/assets/forms.py
index e33c87ec..a6c33c8e 100644
--- a/assets/forms.py
+++ b/assets/forms.py
@@ -1,16 +1,12 @@
 from django import forms
 from django.core.exceptions import ValidationError
+import re
 
 from assets import models
 
 
 class AssetForm(forms.ModelForm):
     
-
-    def clean_date_sold(self):
-        if self.cleaned_data["date_sold"] and self.cleaned_data["date_acquired"] > self.cleaned_data["date_sold"]:
-            raise ValidationError("Cannot sell an item before it is acquired")
-        return self.cleaned_data["date_sold"]
     
     class Meta:
         model = models.Asset
@@ -19,10 +15,61 @@ class AssetForm(forms.ModelForm):
             'is_cable' : forms.CheckboxInput()
         }
 
+    def clean_date_sold(self):
+        if self.cleaned_data["date_sold"] and self.cleaned_data["date_acquired"] > self.cleaned_data["date_sold"]:
+            raise ValidationError("Cannot sell an item before it is acquired")
+        return self.cleaned_data["date_sold"]
+    
+    def clean_asset_id(self):
+        # If the asset ID has been changed
+        if self.instance.asset_id and self.instance.asset_id == self.cleaned_data["asset_id"]: #If the item was not changed
+            return self.cleaned_data["asset_id"]
+        else:
+            if re.search("^[a-zA-Z0-9]+$", self.cleaned_data["asset_id"]) == None:
+                raise ValidationError("An Asset ID can only consist of letters and numbers")
+            return self.cleaned_data["asset_id"]
+
+    def clean_purchase_price(self):
+        purchase_price = self.cleaned_data["purchase_price"]
+        if purchase_price and purchase_price < 0:
+            raise ValidationError("A price cannot be negative")
+        return purchase_price
+
+    def clean_salvage_value(self):
+        salvage_value = self.cleaned_data["salvage_value"]
+        if salvage_value and salvage_value < 0:
+            raise ValidationError("A price cannot be negative")
+        return salvage_value
+
+
 class CableForm(AssetForm):
     class Meta(AssetForm.Meta):
         model = models.Cable
 
+    def clean_length(self):
+        length = self.cleaned_data["length"]
+        if length <= 0:
+            raise ValidationError("The length of a cable must be more than 0")
+        return length
+
+    def clean_csa(self):
+        csa = self.cleaned_data["csa"]
+        if csa <= 0:
+            raise ValidationError("The CSA of a cable must be more than 0")
+        return csa
+
+    def clean_circuits(self):
+        circuits = self.cleaned_data["circuits"]
+        if circuits <= 0:
+            raise ValidationError("There must be at least one circuit")
+        return circuits
+    
+    def clean_cores(self):
+        cores = self.cleaned_data["cores"]
+        if cores <= 0:
+            raise ValidationError("There must be at least one core")
+        return cores
+
 class SupplierForm(forms.Form):
     class Meta:
         model = models.Supplier
diff --git a/assets/migrations/0009_auto_20191008_2148.py b/assets/migrations/0009_auto_20191008_2148.py
new file mode 100644
index 00000000..cbb474cc
--- /dev/null
+++ b/assets/migrations/0009_auto_20191008_2148.py
@@ -0,0 +1,18 @@
+# Generated by Django 2.0.13 on 2019-10-08 20:48
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('assets', '0008_auto_20191002_1931'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='asset',
+            name='asset_id',
+            field=models.CharField(max_length=10, unique=True),
+        ),
+    ]
diff --git a/assets/models.py b/assets/models.py
index 37a57628..adeb2ced 100644
--- a/assets/models.py
+++ b/assets/models.py
@@ -40,7 +40,7 @@ class Supplier(models.Model):
 class Asset(PolymorphicModel):
 
     parent = models.ForeignKey(to='self', related_name='asset_parent', blank=True, null=True, on_delete=models.SET_NULL)
-    asset_id = models.CharField(max_length=10)
+    asset_id = models.CharField(max_length=10, unique=True)
     description = models.CharField(max_length=120)
     category = models.ForeignKey(to=AssetCategory, on_delete=models.CASCADE)
     status = models.ForeignKey(to=AssetStatus, on_delete=models.CASCADE)
diff --git a/assets/views.py b/assets/views.py
index 3791edbc..e05a5e5c 100644
--- a/assets/views.py
+++ b/assets/views.py
@@ -74,7 +74,6 @@ class AssetEdit(LoginRequiredMixin, generic.UpdateView):
 
     def get_context_data(self, **kwargs):
         context = super().get_context_data(**kwargs)
-        context['form'] = forms.AssetForm
         context['edit'] = True
 
         return context