Determination of Seasons in Purchasing Documents 
You manufacture fashion wear according to the season in which you want to sell it. In purchasing documents, the system determines season at the document level and displays the details at the item level. In documents such as purchase order and stock transport order, the system determines season based on the season assignment in the article master and the settings in the following Customizing activities:
Maintain Purchasing Document Types for Fashion Management
Maintain Purchase Order Types per Purchasing Area for Fashion Management
Maintain Stock Transport Order Types per Purchasing Area for Fashion Mgmt
Whenever you mention the supplying plant, the system considers the sales periods for season determination.
Prerequisites
You must have done the following settings for successful season determination:
You have assigned a season to the article in the article master. For more information, see Season Workbench.
You have set the order dates and the delivery dates so that they are within the date range you have specified in the season master data.
You have maintained the season determination process in the following customizing activities under
Materials Management 
Purchasing Purchase Order 
Maintain Purchasing Document Types for Fashion Management
Maintain Purchase Order Types per Purchasing Area for Fashion Management
Maintain Stock Transport Order Types per Purchasing Area for Fashion Mgmt
Features
The system validates the information regarding season, collection, and theme during goods movement. When you create invoice verification with reference to purchase order, the system copies the season information for the article from the reference purchase order.
In the following documents, the system copies the season information from the reference document, such as purchase order:
Inbound delivery
Invoice verification
In the following documents, the system determines season based on the batches assigned or determined for an article and only if you select Season Act. IM option in the article master:
Physical inventory
Correction postings
Transfer postings
Batch master
Stock overview
Season Determination in Manually Created Documents
When you enter a generic article and delivery date in purchasing documents such as purchase order, the system automatically determines the relevant season for the article. However, if there is more than one valid season, you can select a different season. After you select the season, it becomes the proposed season for all variants in the document having the same combination of season and delivery date.
If you change the season, the collection, or the theme in a document, the system triggers a new season determination. If the new season data is not valid, the system displays a message and you can choose a different set of valid seasons, collections, and themes.
If you change a delivery date, the system checks for the corresponding season, collection, and theme and automatically determines the best match for the season.
Season Determination in Follow-on Documents
If you generate an inbound delivery with reference to a purchase order, the system copies the season, the collection, and the theme from purchase order. You cannot change the season in inbound delivery. However, you can view the list of valid seasons.
Mass Season Processing
For more information about mass season processing, see Mass Season Processing