Added context variables for purchase orders (#471)

* Changed IDs of pictures

* Added context variables for pruchase order

* Name change

* Removed PO variables from context_variables because of double

* Typo

docs/extend/plugins/settings.md

@@ -55,7 +55,7 @@ class PluginWithSettings(SettingsMixin, InvenTreePlugin):
     }
 ```
 
-This mixin defines the helper functions `plugin.get_setting` and `plugin.set_seting` to access all plugin specific settings:
+This mixin defines the helper functions `plugin.get_setting` and `plugin.set_setting` to access all plugin specific settings:
 
 ```python
 api_url = self.get_setting('API_URL', cache = False)

docs/report/build.md

@@ -53,7 +53,7 @@ The following variables are accessed by build.variable
 | target_date | Date the build will be overdue |
 | take_from | [StockLocation](./context_variables.md#stocklocation) to take stock from to make this build (if blank, can take from anywhere) |
 | title | The full name of the build |
-| title | The description of the build |
+| description | The description of the build |
 | allocated_stock.all | A query set with all allocated stock items for the build |
 
 As usual items in a query sets can be selected by adding a .n to the set e.g. build.required_parts.0

docs/report/context_variables.md

@@ -220,16 +220,7 @@ Each part object has access to a lot of context variables about the part. The fo
 !!! incomplete "TODO"
     This section requires further work
 
-#### Purchase Order
-
-A [Purchase Order](../buy/po.md) object has the following context variables available.
-
-| Variable | Description |
-|----------|-------------|
-| description | The order description |
-| lines | The lines in the Purchase Order |
-| reference | The reference number |
-| supplier | The supplier for this Purchase Order |
+The [Purchase Order](../buy/po.md) context variables are described in the [Purchase Order](purchase_order.md) section.
 
 #### SalesOrder
 

docs/report/purchase_order.md

@@ -17,11 +17,31 @@ In addition to the default report context variables, the following variables are
 | Variable | Description |
 | --- | --- |
 | order | The specific Purchase Order object |
-| reference | The order reference field (can also be accessed as `{% raw %}{{ order.description }}{% endraw %}`) |
+| reference | The order reference field (can also be accessed as `{% raw %}{{ order.reference }}{% endraw %}`) |
 | description | The order description field |
 | supplier | The [supplier](../buy/supplier.md) associated with this purchase order |
 | lines | A list of available line items for this order |
 | extra_lines | A list of available *extra* line items for this order | 
+| order.created_by | The user who created the order | 
+| order.responsible | The user or group who is responsible for the order | 
+| order.creation_date | The date when the order was created | 
+| order.target_date | The date when the order should arrive | 
+| order.if_overdue | Boolean value that tells if the target date has passed | 
+
+#### Lines
+The lines have sub variables.
+
+| Variable | Description |
+| --- | --- |
+| quantity | The quantity of the part to be ordered |
+| part | The supplier part to be ordered |
+| part | The [supplierpart ](./context_variables.md#supplierpart) object that the build references |
+| reference | The reference given in the part of the order |
+| notes | The notes given in the part of the order |
+| target_date | The date when the part should arrive. Each part can have an individual date |
+| price | The price the part supplierpart |
+| destination | The stock location where the part will be stored |
+
 
 ### Default Report Template