diff --git a/NAMESPACE b/NAMESPACE
index e24947703..e1c061d7d 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -30,7 +30,6 @@ export(correlation)
 export(crps_sample)
 export(dispersion)
 export(dss_sample)
-export(get_complete_forecasts)
 export(get_duplicate_forecasts)
 export(get_forecast_unit)
 export(interval_coverage_deviation_quantile)
diff --git a/R/available_forecasts.R b/R/available_forecasts.R
index b5ead907f..515d8666b 100644
--- a/R/available_forecasts.R
+++ b/R/available_forecasts.R
@@ -40,7 +40,7 @@ available_forecasts <- function(data,
 
   data <- validate(data)
   forecast_unit <- attr(data, "forecast_unit")
-  data <- get_complete_forecasts(data)
+  data <- na.omit(data)
 
   if (is.null(by)) {
     by <- forecast_unit
diff --git a/R/get_-functions.R b/R/get_-functions.R
index b47d5cbb7..459ee9818 100644
--- a/R/get_-functions.R
+++ b/R/get_-functions.R
@@ -269,25 +269,3 @@ get_scoringutils_attributes <- function(object) {
   }
   return(attr_list)
 }
-
-
-#' Get Complete Forecasts
-#' @description Helper function to remove rows from a data.frame where the
-#' value in either one of the columns `predicted` or `observed` is `NA`.
-#' @inheritParams score
-#' @return A data.table with the same columns as the input, but
-#' without rows where either `predicted` or `observed` is `NA`.
-#' @export
-#' @keywords check-forecasts
-get_complete_forecasts <- function(data) {
-  data <- ensure_data.table(data)
-  assert(check_columns_present(data, c("observed", "predicted")))
-  data <- data[!is.na(observed) & !is.na(predicted)]
-  if (nrow(data) == 0) {
-    stop(
-      "After removing NA values in `observed` and `predicted`, ",
-      "there were no observations left"
-    )
-  }
-  return(data[])
-}
diff --git a/R/pit.R b/R/pit.R
index 959f54e76..8cfca355a 100644
--- a/R/pit.R
+++ b/R/pit.R
@@ -186,7 +186,7 @@ pit <- function(data,
                 n_replicates = 100) {
 
   data <- validate(data)
-  data <- get_complete_forecasts(data)
+  data <- na.omit(data)
   forecast_type <- get_forecast_type(data)
 
   if (forecast_type == "quantile") {
diff --git a/R/score.R b/R/score.R
index 5894a29ca..3785e931b 100644
--- a/R/score.R
+++ b/R/score.R
@@ -149,7 +149,7 @@ score.default <- function(data, ...) {
 #' @export
 score.scoringutils_binary <- function(data, metrics = metrics_binary, ...) {
   data <- validate(data)
-  data <- get_complete_forecasts(data)
+  data <- na.omit(data)
   metrics <- validate_metrics(metrics)
 
   data <- apply_metrics(
@@ -169,7 +169,7 @@ score.scoringutils_binary <- function(data, metrics = metrics_binary, ...) {
 #' @export
 score.scoringutils_point <- function(data, metrics = metrics_point, ...) {
   data <- validate(data)
-  data <- get_complete_forecasts(data)
+  data <- na.omit(data)
   metrics <- validate_metrics(metrics)
 
   data <- apply_metrics(
@@ -186,7 +186,7 @@ score.scoringutils_point <- function(data, metrics = metrics_point, ...) {
 #' @export
 score.scoringutils_sample <- function(data, metrics = metrics_sample, ...) {
   data <- validate(data)
-  data <- get_complete_forecasts(data)
+  data <- na.omit(data)
   forecast_unit <- attr(data, "forecast_unit")
   metrics <- validate_metrics(metrics)
 
@@ -223,7 +223,7 @@ score.scoringutils_sample <- function(data, metrics = metrics_sample, ...) {
 #' @export
 score.scoringutils_quantile <- function(data, metrics = metrics_quantile, ...) {
   data <- validate(data)
-  data <- get_complete_forecasts(data)
+  data <- na.omit(data)
   forecast_unit <- attr(data, "forecast_unit")
   metrics <- validate_metrics(metrics)
 
diff --git a/R/validate.R b/R/validate.R
index d283f7aa8..671eed16b 100644
--- a/R/validate.R
+++ b/R/validate.R
@@ -146,6 +146,12 @@ validate_general <- function(data) {
     setattr(data, "messages", messages)
   }
 
+  if (nrow(na.omit(data)) == 0) {
+    stop(
+      "After removing rows with NA values in the data, nothing is left."
+    )
+  }
+
   return(data[])
 }
 
diff --git a/man/get_complete_forecasts.Rd b/man/get_complete_forecasts.Rd
deleted file mode 100644
index 26ea45cc2..000000000
--- a/man/get_complete_forecasts.Rd
+++ /dev/null
@@ -1,20 +0,0 @@
-% Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/get_-functions.R
-\name{get_complete_forecasts}
-\alias{get_complete_forecasts}
-\title{Get Complete Forecasts}
-\usage{
-get_complete_forecasts(data)
-}
-\arguments{
-\item{data}{A data.frame or data.table with predicted and observed values.}
-}
-\value{
-A data.table with the same columns as the input, but
-without rows where either \code{predicted} or \code{observed} is \code{NA}.
-}
-\description{
-Helper function to remove rows from a data.frame where the
-value in either one of the columns \code{predicted} or \code{observed} is \code{NA}.
-}
-\keyword{check-forecasts}
diff --git a/tests/testthat/test-get_-functions.R b/tests/testthat/test-get_-functions.R
index 3b704107d..532574a14 100644
--- a/tests/testthat/test-get_-functions.R
+++ b/tests/testthat/test-get_-functions.R
@@ -29,25 +29,21 @@ fixed = TRUE
 
 
 # ==============================================================================
-# `get_complete_forecasts()`
+# Test removing `NA` values from the data
 # ==============================================================================
-test_that("get_complete_forecasts() works as expected", {
-  expect_equal(nrow(get_complete_forecasts(example_quantile)), 20401)
+test_that("removing NA rows from data works as expected", {
+  expect_equal(nrow(na.omit(example_quantile)), 20401)
 
   ex <- data.frame(observed = c(NA, 1:3), predicted = 1:4)
-  expect_equal(nrow(get_complete_forecasts(ex)), 3)
+  expect_equal(nrow(na.omit(ex)), 3)
 
   ex$predicted <- c(1:3, NA)
-  expect_equal(nrow(get_complete_forecasts(ex)), 2)
+  expect_equal(nrow(na.omit(ex)), 2)
 
+  ex <- data.table::copy(example_quantile)[, "predicted" := NA_real_]
   expect_error(
-    get_complete_forecasts(data.frame(x = 1:2, y = 1:2)),
-    "Assertion on 'data' failed: Columns 'observed', 'predicted' not found in data."
-  )
-
-  expect_error(
-    get_complete_forecasts(data.frame(observed = c(NA, NA), predicted = 1:2)),
-    "After removing NA values in `observed` and `predicted`, there were no observations left"
+    validate(ex),
+    "After removing rows with NA values in the data, nothing is left."
   )
 })