diff --git a/applications/apertif/commissioning/tests/verify_correlator_db_output.py b/applications/apertif/commissioning/tests/verify_correlator_db_output.py
index 5a0184967616c7dc910480a0ebbebcaeb21e6ca5..3d23a00d570a4bf897ed9fa66ccc1c7dec9f0799 100644
--- a/applications/apertif/commissioning/tests/verify_correlator_db_output.py
+++ b/applications/apertif/commissioning/tests/verify_correlator_db_output.py
@@ -69,6 +69,7 @@ c_dbSize       = 1024
 c_dbPattern    = [13]*c_dbSize
 
 c_baseSrcMac = 0x002286080000
+
 c_wcudata = 1      # is 1 if Data Write is 'wcudata1', else is 2 if DataWriter is 'wcudata2', as defined in central_commands.sh
 if c_wcudata==1:
     c_baseDstMacEth01 = 0xe41d2de42690
@@ -77,6 +78,9 @@ else:
     c_baseDstMacEth01 = 0xe41d2dbc3dc0
     c_baseDstMacEth23 = 0xe41d2de40d30
 
+c_expIdMarker = 65
+c_expIdVersion = 2
+
 wsrtTelescopes = ['2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd']
 
 ###############################################################################
@@ -156,6 +160,15 @@ for bui in beamlets:
         ###############################################################################
         # Verification per PN
         for ni,nr in enumerate(tc.nodeNrs):  # loop PN
+            # Get read packet data
+            reportStr = 'unb = %2d, pn = %d, bui = %3d, ch = %2d : ' % (unb, pn, bui, ch)
+            rdData = dbOutputReadData[ni]
+            
+            ###################################################################
+            # Verify header fields
+            unb = nr / nof_pn       # = range(N_band) = 0:15 = [0:127] / 8
+            pn  = nr % nof_pn       # = range(nof_pn) = 0:7 = [0:127] % 8
+            
             # Beamlet mapping as specified in SP-062 table 6 (SC1), 9 (SC4):
             #
             #   u  bi  dest        bu_i
@@ -179,16 +192,13 @@ for bui in beamlets:
             #   1   1    5    BN1  513  515  ...
             #   2   1    6    BN2  768  770  ...
             #   3   1    7    BN3  769  771  ...
-            unb = nr / nof_pn       # = range(N_band) = 0:15 = [0:127] / 8
-            pn  = nr % nof_pn       # = range(nof_pn) = 0:7 = [0:127] % 8
-            
             expBeamlet = N_slot * unb                                                    # offset for UniBoard band
             expBeamlet = expBeamlet + N_clk * (pn / Q_interleave) + (pn % Q_interleave)  # offset for Local PN
             expBeamlet = expBeamlet + bui * Q_interleave                                 # offset serial beamlets
             expChannel = cm.reverse_bits(ch, N_chan_x_w)
             expChannel = cm.invert_msbit(expChannel, N_chan_x_w)
 
-            # Verify header fields
+            # Header fields
             #    0 gap(16) + ETH dst mac hi(16)
             #    1 ETH dst mac lo
             #    2 ETH src mac hi
@@ -211,9 +221,6 @@ for bui in beamlets:
             #   19 FLAG
             #   20 FLAG
             
-            rdData = dbOutputReadData[ni]
-            reportStr = 'unb = %2d, pn = %d, bui = %3d, ch = %2d : ' % (unb, pn, bui, ch)
-            
             # . dst mac as defined in central_commands.sh
             if   unb< 4: expDstMac = c_baseDstMacEth01
             elif unb< 8: expDstMac = c_baseDstMacEth01 + 1
@@ -238,6 +245,22 @@ for bui in beamlets:
                 tc.append_log(tc.V_ERRORS, reportStr + 'read source MAC is wrong (read 0x%012X != 0x%012X expected)' % (rdSrcMac, expSrcMac))
                 tc.set_result('FAILED')
 
+            # . ID marker
+            rdIdMarker = cm.to_unsigned(rdData[11], 32) >> 24
+            if rdIdMarker == c_expIdMarker:
+                tc.append_log(tc.V_INFO_DETAILS, reportStr + 'ID marker = %d is OK' % rdIdMarker)
+            else:
+                tc.append_log(tc.V_ERRORS, reportStr + 'read ID marker is wrong (read %d != %d expected)' % (rdIdMarker, c_expIdMarker))
+                tc.set_result('FAILED')
+
+            # . ID version
+            rdIdVersion = cm.to_unsigned(rdData[11], 24) >> 16
+            if rdIdVersion == c_expIdVersion:
+                tc.append_log(tc.V_INFO_DETAILS, reportStr + 'ID version = %d is OK' % rdIdVersion)
+            else:
+                tc.append_log(tc.V_ERRORS, reportStr + 'read ID version is wrong (read %d != %d expected)' % (rdIdVersion, c_expIdVersion))
+                tc.set_result('FAILED')
+                
             # . beamlet
             rdBeamlet = cm.to_unsigned(rdData[11], 16)
             if rdBeamlet == expBeamlet: