diff --git a/DESCRIPTION b/DESCRIPTION
index f9ad8cb..5bd38a6 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: rjd3toolkit
 Type: Package
 Title: Toolkit Functions Around 'JDemetra+ 3.0'
-Version: 3.1.1
+Version: 3.2.0
 Authors@R: c(
   person("Jean", "Palate", role = c("aut", "cre"),
                 email = "jean.palate@nbb.be"),
diff --git a/NAMESPACE b/NAMESPACE
index 2e8d6a4..ae00fd0 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -154,6 +154,7 @@ export(add_ramp)
 export(add_usrdefvar)
 export(aggregate)
 export(ao_variable)
+export(arima_difference)
 export(arima_model)
 export(arima_properties)
 export(arima_sum)
diff --git a/R/arima.R b/R/arima.R
index 9c0f6a8..a96c26e 100644
--- a/R/arima.R
+++ b/R/arima.R
@@ -185,6 +185,30 @@ arima_lsum<-function(components){
   return (.jd2r_arima(jsum))
 }
 
+#' Remove an arima model from an existing one
+#'
+#' @param left Left operand
+#' @param right Right operand
+#' @param simplify Simplify the results
+#'
+#' @return a `"JD3_ARIMA"` model.
+#' @export
+#'
+#' @details
+#'
+#' @examples
+#' mod1 = arima_model(delta = c(1,-2,1))
+#' mod2 = arima_model(variance=.01)
+#' diff<- arima_difference(mod1, mod2)
+#'
+arima_difference<-function(left, right, simplify=TRUE){
+  jleft<-.r2jd_arima(left)
+  jright<-.r2jd_arima(right)
+  jdiff<-.jcall(jleft, "Ljdplus/toolkit/base/core/arima/ArimaModel;", "minus", jright, as.logical(simplify))
+  return (.jd2r_arima(jdiff))
+}
+
+
 #' ARIMA Properties
 #'
 #' @param model a `"JD3_ARIMA"` model (created with [arima_model()]).
@@ -291,7 +315,7 @@ ucarima_canonical<-function(ucm, cmp=0, adjust=TRUE){
 #' @examples
 ucarima_estimate<-function(x, ucm, stdev=TRUE){
   jucm<-.r2jd_ucarima(ucm)
-  jcmps<-.jcall("jdplus/toolkit/base/r/arima/UcarimaModels", "Ljdplus/toolkit/base/core/math/matrices/Matrix;", "estimate",
+  jcmps<-.jcall("jdplus/toolkit/base/r/arima/UcarimaModels", "Ljdplus/toolkit/base/api/math/matrices/Matrix;", "estimate",
                 as.numeric(x), jucm, as.logical(stdev))
   return (.jd2r_matrix(jcmps))
 }
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diff --git a/man/arima_difference.Rd b/man/arima_difference.Rd
new file mode 100644
index 0000000..2203d46
--- /dev/null
+++ b/man/arima_difference.Rd
@@ -0,0 +1,27 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/arima.R
+\name{arima_difference}
+\alias{arima_difference}
+\title{Remove an arima model from an existing one}
+\usage{
+arima_difference(left, right, simplify = TRUE)
+}
+\arguments{
+\item{left}{Left operand}
+
+\item{right}{Right operand}
+
+\item{simplify}{Simplify the results}
+}
+\value{
+a \code{"JD3_ARIMA"} model.
+}
+\description{
+Remove an arima model from an existing one
+}
+\examples{
+mod1 = arima_model(delta = c(1,-2,1))
+mod2 = arima_model(variance=.01)
+diff<- arima_difference(mod1, mod2)
+
+}