diff --git a/src/DIRAC/TransformationSystem/Client/TransformationFilesStatus.py b/src/DIRAC/TransformationSystem/Client/TransformationFilesStatus.py
index 73a4731e612..d35e5e67c17 100644
--- a/src/DIRAC/TransformationSystem/Client/TransformationFilesStatus.py
+++ b/src/DIRAC/TransformationSystem/Client/TransformationFilesStatus.py
@@ -17,6 +17,8 @@
 PROB_IN_FC = "ProbInFC"
 #:
 REMOVED = "Removed"
+#:
+DELETED = "Deleted"
 
 # below ones are for inherited transformations
 #:
diff --git a/src/DIRAC/TransformationSystem/DB/TransformationDB.py b/src/DIRAC/TransformationSystem/DB/TransformationDB.py
index 37ec1b752cd..3f7aa4ef2dc 100755
--- a/src/DIRAC/TransformationSystem/DB/TransformationDB.py
+++ b/src/DIRAC/TransformationSystem/DB/TransformationDB.py
@@ -15,6 +15,7 @@
 from DIRAC import gLogger, S_OK, S_ERROR
 from DIRAC.Core.Base.DB import DB
 from DIRAC.Core.Utilities.DErrno import cmpError
+from DIRAC.TransformationSystem.Client import TransformationFilesStatus
 from DIRAC.Resources.Catalog.FileCatalog import FileCatalog
 from DIRAC.Core.Security.ProxyInfo import getProxyInfo
 from DIRAC.Core.Utilities.List import stringListToString, intListToString, breakListIntoChunks
@@ -1126,7 +1127,7 @@ def __addMetaQuery(self, transID, queryDict, queryType, author="", connection=Fa
 
         for parameterName in sorted(queryDict):
             parameterValue = queryDict[parameterName]
-            if not parameterValue:
+            if parameterValue is None:
                 continue
             parameterType = "String"
             if isinstance(parameterValue, (list, tuple)):
@@ -1138,6 +1139,9 @@ def __addMetaQuery(self, transID, queryDict, queryType, author="", connection=Fa
                 if isinstance(parameterValue, int):
                     parameterType = "Integer"
                     parameterValue = str(parameterValue)
+                if isinstance(parameterValue, float):
+                    parameterType = "Float"
+                    parameterValue = str(parameterValue)
                 if isinstance(parameterValue, dict):
                     parameterType = "Dict"
                     parameterValue = str(parameterValue)
@@ -1617,6 +1621,26 @@ def addFile(self, fileDicts, force=False, connection=False):
             gLogger.info("Files to add to transformations:", filesToAdd)
             if filesToAdd:
                 for transID, lfns in transFiles.items():
+                    # Check if file is already in the Transformation and if is in Deleted Status
+                    res = self.getTransformationFiles(
+                        condDict={"TransformationID": transID, "LFN": lfns}, connection=connection
+                    )
+                    if not res["OK"]:
+                        return res
+                    for fileDict in res["Value"]:
+                        if fileDict["Status"] == TransformationFilesStatus.DELETED:
+                            res = self.__setTransformationFileStatus(
+                                list([fileDict["FileID"]]), TransformationFilesStatus.UNUSED, connection=connection
+                            )
+                            if not res["OK"]:
+                                return res
+                            if not (
+                                res := self.__setDataFileStatus(
+                                    list([fileDict["FileID"]]), "New", connection=connection
+                                )["OK"]
+                            ):
+                                return res
+
                     res = self.addFilesToTransformation(transID, lfns)
                     if not res["OK"]:
                         gLogger.error("Failed to add files to transformation", f"{transID} {res['Message']}")
@@ -1689,7 +1713,7 @@ def __addDirectory(self, path, force):
                 successful.append(lfn)
         return {"OK": True, "Value": len(res["Value"]["Successful"]), "Successful": successful, "Failed": failed}
 
-    def setMetadata(self, path, usermetadatadict):
+    def setMetadata(self, path, usermetadatadict, connection=False):
         """
         It can be applied to a file or to a directory (path).
         For a file, add the file to Transformations if the updated metadata dictionary passes the filter.
@@ -1747,6 +1771,23 @@ def setMetadata(self, path, usermetadatadict):
         gLogger.info("Files to add to transformations:", filesToAdd)
         if filesToAdd:
             for transID, lfns in transFiles.items():
+                # Check if file is already in the Transformation and if is in Deleted Status
+                res = self.getTransformationFiles(
+                    condDict={"TransformationID": transID, "LFN": lfns}, connection=connection
+                )
+                if not res["OK"]:
+                    return res
+                for fileDict in res["Value"]:
+                    if fileDict["Status"] == TransformationFilesStatus.DELETED:
+                        res = self.__setTransformationFileStatus(
+                            list([fileDict["FileID"]]), TransformationFilesStatus.UNUSED, connection=connection
+                        )
+                        if not res["OK"]:
+                            return res
+                        res = self.__setDataFileStatus(list([fileDict["FileID"]]), "New", connection=connection)
+                        if not res["OK"]:
+                            return res
+
                 res = self.addFilesToTransformation(transID, lfns)
                 if not res["OK"]:
                     gLogger.error("Failed to add files to transformation", f"{transID} {res['Message']}")