diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index 8286d67a20..fc39e7c844 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -1328,6 +1328,17 @@ class PSBTTest(BitcoinTestFramework):
         #     assert hash.hex() in res_input[preimage_key]
         #     assert_equal(res_input[preimage_key][hash.hex()], preimage.hex())
 
+        # ELEMENTS FIXME
+        # self.log.info("Test that combining PSBTs with different transactions fails")
+        # tx = CTransaction()
+        # tx.vin = [CTxIn(outpoint=COutPoint(hash=int('aa' * 32, 16), n=0), scriptSig=b"")]
+        # tx.vout = [CTxOut(nValue=0, scriptPubKey=b"")]
+        # psbt1 = PSBT(g=PSBTMap({PSBT_GLOBAL_UNSIGNED_TX: tx.serialize()}), i=[PSBTMap()], o=[PSBTMap()]).to_base64()
+        # tx.vout[0].nValue += 1  # slightly modify tx
+        # psbt2 = PSBT(g=PSBTMap({PSBT_GLOBAL_UNSIGNED_TX: tx.serialize()}), i=[PSBTMap()], o=[PSBTMap()]).to_base64()
+        # assert_raises_rpc_error(-8, "PSBTs not compatible (different transactions)", self.nodes[0].combinepsbt, [psbt1, psbt2])
+        # assert_equal(self.nodes[0].combinepsbt([psbt1, psbt1]), psbt1)
+
 
 if __name__ == '__main__':
     PSBTTest().main()
diff --git a/test/functional/test_framework/psbt.py b/test/functional/test_framework/psbt.py
index ad3fe29b62..68945e7e84 100644
--- a/test/functional/test_framework/psbt.py
+++ b/test/functional/test_framework/psbt.py
@@ -96,10 +96,10 @@ class PSBTMap:
 class PSBT:
     """Class for serializing and deserializing PSBTs"""
 
-    def __init__(self):
-        self.g = PSBTMap()
-        self.i = []
-        self.o = []
+    def __init__(self, *, g=None, i=None, o=None):
+        self.g = g if g is not None else PSBTMap()
+        self.i = i if i is not None else []
+        self.o = o if o is not None else []
         self.tx = None
 
     def deserialize(self, f):