diff --git a/src/grib_accessor_class_data_apply_bitmap.c b/src/grib_accessor_class_data_apply_bitmap.c
index de90a01d9..076cf4ebf 100644
--- a/src/grib_accessor_class_data_apply_bitmap.c
+++ b/src/grib_accessor_class_data_apply_bitmap.c
@@ -195,7 +195,7 @@ static int unpack_double(grib_accessor* a, double* val, size_t *len)
     if (err) return err;
 
     if(!grib_find_accessor(grib_handle_of_accessor(a),self->bitmap))
-        return grib_get_double_array_internal(grib_handle_of_accessor(a),self->coded_values,val,len);
+        return grib_get_double_array(grib_handle_of_accessor(a),self->coded_values,val,len);
 
     if((err = grib_get_size(grib_handle_of_accessor(a),self->coded_values,&coded_n_vals)) != GRIB_SUCCESS)
         return err;
@@ -223,7 +223,7 @@ static int unpack_double(grib_accessor* a, double* val, size_t *len)
     coded_vals = (double*)grib_context_malloc(a->context,coded_n_vals*sizeof(double));
     if(coded_vals == NULL) return GRIB_OUT_OF_MEMORY;
 
-    if((err = grib_get_double_array_internal(grib_handle_of_accessor(a),self->coded_values,coded_vals,&coded_n_vals))
+    if((err = grib_get_double_array(grib_handle_of_accessor(a),self->coded_values,coded_vals,&coded_n_vals))
             != GRIB_SUCCESS)
     {
         grib_context_free(a->context,coded_vals);
diff --git a/src/grib_accessor_class_data_ccsds_packing.c b/src/grib_accessor_class_data_ccsds_packing.c
index c414f9874..830d3d9c6 100644
--- a/src/grib_accessor_class_data_ccsds_packing.c
+++ b/src/grib_accessor_class_data_ccsds_packing.c
@@ -230,8 +230,10 @@ static int unpack_double(grib_accessor* a, double* val, size_t *len)
     if((err = grib_get_long_internal(grib_handle_of_accessor(a),self->decimal_scale_factor, &decimal_scale_factor)) != GRIB_SUCCESS)
         return err;
 
-    if((err = grib_get_long_internal(grib_handle_of_accessor(a),self->ccsds_flags,&ccsds_flags)) != GRIB_SUCCESS)
+    /* ECC-477: Don't call grib_get_long_internal to suppress error message being output */
+    if((err = grib_get_long(grib_handle_of_accessor(a),self->ccsds_flags,&ccsds_flags)) != GRIB_SUCCESS)
         return err;
+
     if((err = grib_get_long_internal(grib_handle_of_accessor(a),self->ccsds_block_size, &ccsds_block_size)) != GRIB_SUCCESS)
         return err;
     if((err = grib_get_long_internal(grib_handle_of_accessor(a),self->ccsds_rsi, &ccsds_rsi)) != GRIB_SUCCESS)
diff --git a/src/grib_accessor_class_data_g22order_packing.c b/src/grib_accessor_class_data_g22order_packing.c
index 3423b3439..51fea7c43 100644
--- a/src/grib_accessor_class_data_g22order_packing.c
+++ b/src/grib_accessor_class_data_g22order_packing.c
@@ -489,7 +489,10 @@ static int unpack_double(grib_accessor* a, double* val, size_t *len)
     if((err = grib_get_long_internal(gh,self->binary_scale_factor,&binary_scale_factor )) != GRIB_SUCCESS)  return err;
     if((err = grib_get_long_internal(gh,self->decimal_scale_factor,&decimal_scale_factor )) != GRIB_SUCCESS)  return err;
     if((err = grib_get_long_internal(gh,self->typeOfOriginalFieldValues,&typeOfOriginalFieldValues )) != GRIB_SUCCESS)  return err;
-    if((err = grib_get_long_internal(gh,self->groupSplittingMethodUsed,&groupSplittingMethodUsed )) != GRIB_SUCCESS)  return err;
+
+    /* Don't call grib_get_long_internal to suppress error message being output */
+    if((err = grib_get_long(gh,self->groupSplittingMethodUsed,&groupSplittingMethodUsed )) != GRIB_SUCCESS)  return err;
+
     if((err = grib_get_long_internal(gh,self->missingValueManagementUsed,&missingValueManagementUsed )) != GRIB_SUCCESS)  return err;
     if((err = grib_get_long_internal(gh,self->primaryMissingValueSubstitute,&primaryMissingValueSubstitute )) != GRIB_SUCCESS)  return err;
     if((err = grib_get_long_internal(gh,self->secondaryMissingValueSubstitute,&secondaryMissingValueSubstitute )) != GRIB_SUCCESS)  return err;
diff --git a/tests/grib_ccsds.sh b/tests/grib_ccsds.sh
index 1a175f4c2..3606b41c8 100755
--- a/tests/grib_ccsds.sh
+++ b/tests/grib_ccsds.sh
@@ -37,8 +37,8 @@ infile=${data_dir}/ccsds.grib2
 outfile1=$infile.tmp_ccsds.1
 outfile2=$infile.tmp_ccsds.2
 
-rm -f $outfile1 $outfile2 || true
-${tools_dir}/grib_set -f -r -s packingType=grid_simple $infile $outfile1 2> $REDIRECT
+rm -f $outfile1 $outfile2
+${tools_dir}/grib_set -f -r -s packingType=grid_simple $infile $outfile1
 ${tools_dir}/grib_compare -P -b $BLACKLIST $outfile1 $infile > $REDIRECT
 
 ${tools_dir}/grib_set -r -s packingType=grid_ccsds $outfile1 $outfile2
@@ -52,7 +52,7 @@ then
   exit 1
 fi
 
-rm -f $outfile1 $outfile2 || true
+rm -f $outfile1 $outfile2
 
 infile=${data_dir}/reduced_latlon_surface.grib2
 outfile1=$infile.tmp_ccsds.1
@@ -60,7 +60,7 @@ outfile2=$infile.tmp_ccsds.2
 
 ${tools_dir}/grib_set -r -s packingType=grid_ccsds $infile $outfile1
 ${tools_dir}/grib_compare -P -b $BLACKLIST $infile $outfile1 > $REDIRECT
-${tools_dir}/grib_set -f -r -s packingType=grid_simple $outfile1 $outfile2 2> $REDIRECT
+${tools_dir}/grib_set -f -r -s packingType=grid_simple $outfile1 $outfile2
 ${tools_dir}/grib_compare -P -b $BLACKLIST $outfile2 $outfile1  > $REDIRECT
 
 res1=`${tools_dir}/grib_get '-F%1.2f' -p min,max,avg $infile`
@@ -69,7 +69,7 @@ res3=`${tools_dir}/grib_get '-F%1.2f' -p min,max,avg $outfile2`
 [ "$res1" = "$res2" ]
 [ "$res1" = "$res3" ]
 
-rm -f $outfile1 $outfile2 || true
+rm -f $outfile1 $outfile2
 
 # ECC-297
 infile=${data_dir}/tigge_ecmwf.grib2
@@ -80,4 +80,11 @@ ${tools_dir}/grib_set -r -s bitsPerValue=17 $infile $outfile1
 ${tools_dir}/grib_set -r -s packingType=grid_ccsds $outfile1 $outfile2
 ${tools_dir}/grib_compare -P -c data:n $outfile1 $outfile2
 
+# ECC-477: redundant error message during conversion
+infile=${data_dir}/ccsds.grib2
+rm -f $outfile2
+${tools_dir}/grib_set -f -r -s packingType=grid_simple $infile $outfile1 >$outfile2 2>&1
+# there should be no error messages printed (to stdout or stderr)
+[ ! -s $outfile2 ]
+
 rm -f $outfile1 $outfile2