diff --git a/schemas/course-credential.json b/schemas/course-credential.json
index 25b1d26..3d3d26a 100644
--- a/schemas/course-credential.json
+++ b/schemas/course-credential.json
@@ -103,7 +103,7 @@
                             "description": "The framework in which the course belongs to"
                         },
                         "courseCredits": {
-                            "type": "integer",
+                            "type": ["number", "string"],
                             "description": "The number of (ECTS) credits awarded for the course"
                         },
                         "dateOfAssessment": {
diff --git a/schemas/e-operator-claim.json b/schemas/e-operator-claim.json
index cc6e0c9..d2757b6 100644
--- a/schemas/e-operator-claim.json
+++ b/schemas/e-operator-claim.json
@@ -50,11 +50,11 @@
                         },
                         "operatorNumber": {
                             "description": "Operator number awarded by accrediting entity",
-                            "type": "string"
+                            "type": ["number", "string"]
                         },
                         "limitJurisdiction": {
                             "description": "Regional scope",
-                            "type": "string"
+                            "type": ["number", "string"]
                         },
                         "accreditedFor": {
                             "description": "Operation type: e.g. manufacture, repair, refurbishment, remanufacture, transport, dismantle, recycle, verification, audit",
diff --git a/schemas/federation-membership.json b/schemas/federation-membership.json
index d1e999e..50ce7b5 100644
--- a/schemas/federation-membership.json
+++ b/schemas/federation-membership.json
@@ -46,7 +46,7 @@
             },
             "registrationIdentifier": {
               "description": "Registration identifier of the affiliated organisation",
-              "type": "string"
+              "type": ["number", "string"]
             },
             "publicRegistry": {
               "description": "Registry where the affiliated organisation is registered: 'Generalitat de Catalunya', 'Ministerio del interior de España'",
@@ -58,7 +58,7 @@
             },
             "postCode": {
               "description": "Postal code of the member organisation",
-              "type": "string"
+              "type": ["number", "string"]
             },
             "city": {
               "description": "City of the member organisation",
@@ -66,7 +66,7 @@
             },
             "taxReference": {
               "description": "Tax reference as VAT registration of the member organisation",
-              "type": "string"
+              "type": ["number", "string"]
             },
             "membershipType": {
               "description": "Type of membership: full / observer",
@@ -78,7 +78,7 @@
             },
             "membershipId": {
               "description": "Membership identifier: an internal unique number or code",
-              "type": "string"
+              "type": ["number", "string"]
             },
             "membershipSince": {
               "type": "string",
@@ -89,7 +89,7 @@
               "format": "email"
             },
             "phone": {
-              "type": "string"
+              "type": ["number", "string"]
             },
             "website": {
               "type": "string",
diff --git a/schemas/financial-vulnerability.json b/schemas/financial-vulnerability.json
index e1960d5..ebf7978 100644
--- a/schemas/financial-vulnerability.json
+++ b/schemas/financial-vulnerability.json
@@ -45,7 +45,7 @@
                             "format": "email"
                         },
                         "phoneNumber": {
-                            "type": "string"
+                            "type": ["number", "string"]
                         },
                         "identityDocType": {
                             "description": "Type of the Identity Document of the credential subject",
@@ -69,10 +69,10 @@
                         },
                         "financialVulnerabilityScore": {
                             "description": "Measure of an individual's susceptibility to financial hardship",
-                            "type": "string"
+                            "type": ["number", "string"]
                         },
                         "amountCoveredByOtherAids": {
-                            "type": "string"
+                            "type": ["number", "string"]
                         },
                         "connectivityOptionList": {
                             "type": "string"
diff --git a/schemas/membership-card.json b/schemas/membership-card.json
index 3a624ba..211b36e 100644
--- a/schemas/membership-card.json
+++ b/schemas/membership-card.json
@@ -42,7 +42,7 @@
             },
             "membershipId": {
               "description": "Membership identifier",
-              "type": "string"
+              "type": ["number", "string"]
             },
             "affiliatedSince": {
               "type": "string",