forEach

a!localVariables(
  local!filtered: rule!AS_Get_By_Category(ri!filter),
  local!visivel,
  local!id,
  local!info: rule!AS_Get_By_Id(local!id),
  a!headerContentLayout(
    header: {
      a!billboardLayout(
        backgroundMedia: a!documentImage(
          document: cons!BILLBOARD
        ),
        backgroundColor: "#f0f0f0",
        marginBelow: "NONE",
        overlay: a!barOverlay(
          contents: {
            a!richTextDisplayField(
              label: "Appian Store",
              labelPosition: "COLLAPSED",
              value: {
                a!richTextHeader(
                  text: {
                    "Appian Store"
                  },
                  size: "LARGE"
                )
              },
              align: "CENTER"
            )
          }
        )
      )
    },
    contents: {
      a!sectionLayout(
        label: "",
        labelSize: "MEDIUM",
        contents: {
          a!columnsLayout(
            columns: {
              a!columnLayout(
                contents: {
                  a!dropdownField(
                    label: "Category",
                    labelPosition: "ABOVE",
                    placeholder: "--- What are you looking for? ---",
                    choiceLabels: cons!AS_categories,
                    choiceValues: cons!AS_categories,
                    value: ri!filter,
                    saveInto: ri!filter,
                    searchDisplay: "AUTO",
                    validations: {}
                  ),
                  a!forEach(
                    items: local!filtered,
                    expression: 
                    a!boxLayout(
                        label: "",
                        contents: {
                          a!columnsLayout(
                            columns: {
                              a!columnLayout(
                                contents: {
                                  a!imageField(
                                    label: "Image",
                                    labelPosition: "COLLAPSED",
                                    images: {
                                      a!documentImage(
                                        document: fv!item.imageId
                                        )
                                      
                                    },
                                    size: "MEDIUM",
                                    isThumbnail: false,
                                    style: "STANDARD"
                                  )
                                }
                              ),
                              a!columnLayout(
                                contents: {
                                  a!sideBySideLayout(
                                    items: {
                                      a!sideBySideItem(
                                        item: a!richTextDisplayField(
                                          labelPosition: "COLLAPSED",
                                          value: {
                                            a!richTextItem(
                                              text: {
                                                fv!item.name
                                                },
                                              size: "MEDIUM_PLUS"
                                            )
                                          }
                                        )
                                      ),
                                      a!sideBySideItem(
                                        item: a!buttonArrayLayout(
                                          buttons: {
                                            a!buttonWidget(
                                              label: "details",
                                              icon: "info",
                                              saveInto: {a!save(local!visivel,true()),
                                              a!save(local!id,local!filtered.id)
                                              },
                                              size: "LARGE",
                                              style: "NORMAL"
                                            )
                                          },
                                          align: "END"
                                        )
                                      )
                                    }
                                  ),
                                  a!sideBySideLayout(
                                    items: {
                                      a!sideBySideItem(
                                        item: a!richTextDisplayField(
                                          label: "Price",
                                          labelPosition: "ABOVE",
                                          value: {
                                            a!richTextItem(
                                              text: {"$" &fv!item.price}
                                            )
                                          }
                                        )
                                      ),
                                      a!sideBySideItem(
                                        item: a!richTextDisplayField(
                                          label: "Quantity",
                                          labelPosition: "ABOVE",
                                          value: {
                                            a!richTextItem(
                                              text: {fv!item.quantity}
                                            )
                                          }
                                        )
                                      ),
                                      a!sideBySideItem(
                                        item: a!buttonArrayLayout(
                                          buttons: {
                                            a!buttonWidget(
                                              label: "add to cart",
                                              icon: "shopping-cart",
                                              size: "LARGE",
                                              width: "MINIMIZE",
                                              style: "PRIMARY"
                                            )
                                          },
                                          align: "END"
                                        )
                                      )
                                    }
                                  )
                                },
                                width: "WIDE"
                              )
                            }
                          )
                        },
                        style: "#f3f3f3",
                        marginBelow: "STANDARD"
                        
                      )
                  )
                }
              )
            }
          )
        },showWhen: isnull(local!visivel)
      ),
      a!richTextDisplayField(
        labelPosition: "COLLAPSED",
        value: {
          a!richTextItem(
            text: {
              a!richTextIcon(
                icon: "long-arrow-left"
              ),
              " Back to the store"
            },
            link: a!dynamicLink(
              value: null,
              saveInto: {a!save(local!visivel,null()),
              a!save(local!id,null())}
            ),
            linkstyle: "STANDALONE"
          )
        },
        showWhen: not(isnull(local!visivel))
      )
    }
  )
)

between line 97 and 105 iits where i try to save the id of the item