diff --git a/src/MNH/contrav.f90 b/src/MNH/contrav.f90
index 50e81468802efef8d210ae1736c96011e3bbbede..c890435f523160d94c0da938e847bf36c21b1da6 100644
--- a/src/MNH/contrav.f90
+++ b/src/MNH/contrav.f90
@@ -201,8 +201,20 @@ END IF
 !              ------------------------------------
 !
 IF (LFLAT) THEN
-  PRWCT(:,:,:) = PRWT(:,:,:) / PDZZ(:,:,:)
-  RETURN
+   !
+   PRWCT(:,:,:) = PRWT(:,:,:) / PDZZ(:,:,:)
+   !
+   IF (KADV_ORDER == 4 ) THEN
+      NULLIFY(TZFIELD_U)
+      NULLIFY(TZFIELD_V)
+      CALL ADD3DFIELD_ll( TZFIELD_U, PRUCT, 'CONTRAV::PRUCT' )
+      CALL ADD3DFIELD_ll( TZFIELD_V, PRVCT, 'CONTRAV::PRVCT' )
+      CALL UPDATE_HALO_ll(TZFIELD_U,IINFO_ll)
+      CALL UPDATE_HALO_ll(TZFIELD_V,IINFO_ll)
+   ENDIF
+   !
+   RETURN
+   !
 END IF
 !
 !*       3.    Compute the vertical contravariant components (general case)
diff --git a/src/MNH/initial_guess.f90 b/src/MNH/initial_guess.f90
index 004d6be13168a80d05113e16940d8d9283283f72..cba1058bc1b554620e674215843be01b2218f9ae 100644
--- a/src/MNH/initial_guess.f90
+++ b/src/MNH/initial_guess.f90
@@ -153,6 +153,7 @@ use modd_budget,     only: lbudget_u,  lbudget_v,  lbudget_w,  lbudget_th, lbudg
                            NBUDGET_RR, NBUDGET_RI, NBUDGET_RS, NBUDGET_RG, NBUDGET_RH,  NBUDGET_SV1,             &
                            lbu_beg, lbu_enable, tbudgets
 USE MODD_CONF
+use modd_conf_n, only: luserv
 USE MODD_GRID_n
 
 use mode_budget,     only: Budget_store_init, Budget_store_end
@@ -213,11 +214,14 @@ IF (SIZE(PTKET,1) /= 0) THEN
   PRTKES(:,:,:) = PTKET(:,:,:) * ZINVTSTEP * PRHODJ(:,:,:)
 END IF
 !
-! Case with KRR moist variables 
-DO JRR=1,KRR
-  PRRS(:,:,:,JRR) = PRT(:,:,:,JRR) * ZINVTSTEP * PRHODJ(:,:,:) 
-END DO
-CALL MPPDB_CHECK3DM("initial_guess:PRRS/RT/RHO",PRECISION,PRRS(:,:,:,1) , PRT(:,:,:,1) , PRHODJ)
+! Case with KRR moist variables
+!
+IF (LUSERV) THEN
+   DO JRR=1,KRR
+      PRRS(:,:,:,JRR) = PRT(:,:,:,JRR) * ZINVTSTEP * PRHODJ(:,:,:)
+   END DO
+   CALL MPPDB_CHECK3DM("initial_guess:PRRS/RT/RHO",PRECISION,PRRS(:,:,:,1) , PRT(:,:,:,1) , PRHODJ)
+ENDIF
 !
 ! *** passive tracers
 !