diff --git a/anno-gui/src/main/java/org/genesys2/anno/converter/RowConverter.java b/anno-gui/src/main/java/org/genesys2/anno/converter/RowConverter.java
index dc672bc25fe2fe7b24125c62bce52774e5e7785a..d4f74dda58310b1262a315285fbf51b1e67b0506 100644
--- a/anno-gui/src/main/java/org/genesys2/anno/converter/RowConverter.java
+++ b/anno-gui/src/main/java/org/genesys2/anno/converter/RowConverter.java
@@ -352,6 +352,9 @@ public class RowConverter {
 		if (rdfValues == null) {
 			return null;
 		}
+		if (rdfValues instanceof String && StringUtils.isBlank(rdfValues.toString())) {
+			return null;
+		}
 		if (targetType == String.class) {
 			return new TextNode(rdfValues.toString());
 		}
diff --git a/anno-gui/src/main/java/org/genesys2/anno/predefined/GenesysJSON.java b/anno-gui/src/main/java/org/genesys2/anno/predefined/GenesysJSON.java
index 7c5c2f5f9b2ca67d2a21ba1e4770a9ac08d0f753..4a12e53a3eaf6dd1e95aa904b8b677f12df8d670 100644
--- a/anno-gui/src/main/java/org/genesys2/anno/predefined/GenesysJSON.java
+++ b/anno-gui/src/main/java/org/genesys2/anno/predefined/GenesysJSON.java
@@ -100,6 +100,9 @@ public class GenesysJSON {
 		JsonField doi = new JsonField(Api1Constants.Accession.DOI, RdfMCPD.DOI).setRequired(false);
 		columns.add(doi);
 
+		JsonField dataProviderId = new JsonField(Api1Constants.Accession.DATA_PROVIDER_ID, RdfMCPD.DATA_PROVIDER_ID).setRequired(false);
+		columns.add(dataProviderId);
+
 		JsonField acceNumb = new JsonField(Api1Constants.Accession.ACCENUMB, RdfMCPD.ACCENUMB).setRequired(true);
 		columns.add(acceNumb);
 
diff --git a/anno-gui/src/main/java/org/genesys2/anno/predefined/MCPD.java b/anno-gui/src/main/java/org/genesys2/anno/predefined/MCPD.java
index 1511eb18864702c1736535c28ba21e6a1bf4491c..faef3623f5919b4a85f0ad8f299b766d0c249b1f 100644
--- a/anno-gui/src/main/java/org/genesys2/anno/predefined/MCPD.java
+++ b/anno-gui/src/main/java/org/genesys2/anno/predefined/MCPD.java
@@ -30,6 +30,13 @@ public class MCPD {
 
 	public MCPD() {
 		List<ColumnDef> columns = new ArrayList<ColumnDef>();
+
+		ColumnDef dataProviderId = new ColumnDef("DATA_PROVIDER_ID", "Data provider ID", ColumnDataType.TEXT, true, RdfMCPD.DATA_PROVIDER_ID).setIncludeNull(false);
+		columns.add(dataProviderId);
+
+		ColumnDef doi = new ColumnDef("DOI", "Digital object identifier", ColumnDataType.TEXT, true, RdfMCPD.DOI);
+		columns.add(doi);
+		
 		ColumnDef instCode = new ColumnDef("INSTCODE", "Institute code", ColumnDataType.TEXT, false, RdfMCPD.INSTCODE);
 		instCode.getValidators().add(new FaoWiewsInstCodeValidator());
 		columns.add(instCode);
@@ -38,9 +45,6 @@ public class MCPD {
 		newInstCode.getValidators().add(new FaoWiewsInstCodeValidator());
 		columns.add(newInstCode);
 
-		ColumnDef doi = new ColumnDef("DOI", "Digital object identifier", ColumnDataType.TEXT, true, RdfMCPD.DOI);
-		columns.add(doi);
-
 		ColumnDef acceNumb = new ColumnDef("ACCENUMB", "Accession number", ColumnDataType.TEXT, true, RdfMCPD.ACCENUMB);
 		columns.add(acceNumb);
 
diff --git a/anno-gui/src/main/java/org/genesys2/anno/predefined/RdfMCPD.java b/anno-gui/src/main/java/org/genesys2/anno/predefined/RdfMCPD.java
index d71718b66b6d829d299f06d7d2955e669e10e41e..5ba6cdf1f8d18fba2779cdbe983cac85ac829f32 100644
--- a/anno-gui/src/main/java/org/genesys2/anno/predefined/RdfMCPD.java
+++ b/anno-gui/src/main/java/org/genesys2/anno/predefined/RdfMCPD.java
@@ -21,6 +21,7 @@ public class RdfMCPD {
 	public static final String INSTCODE = "http://rs.tdwg.org/dwc/terms/institutionCode";
 	public static final String INSTCODE_NEW = "https://www.genesys-pgr.org/rdf/mcpd#newInstituteCode";
 	public static final String DOI = "http://prismstandard.org/namespaces/1.2/basic/doi";
+	public static final String DATA_PROVIDER_ID = "https://www.genesys-pgr.org/rdf/mcpd#dataProviderId";
 	public static final String ACCENUMB = "http://purl.org/germplasm/germplasmTerm#germplasmID";
 
 	public static final String ACCENUMB_NEW = "https://www.genesys-pgr.org/rdf/mcpd#newAcceNumb";