Logic to Determine Release Rule 
You can determine which release rule the system uses for a release check. You can choose the release rule in Customizing under 
Logistics - General 
SAP Fashion Management Order Allocation Run (ARun) Online ARun Maintain ARun Types 
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Features
You can use the following options to determine which release rule must be used for an order:
Always Use Default: The release rule defined in the order allocation run (ARun) type is applicable.
S First from Sales Order; 2nd Default: The release rule defined in a sales order is given priority. If the release rule is not found, the system applies the default release rule defined in the ARun type.
F 1st Determination; 2nd Default: The release rule determined by the release strategy is given priority. If the release rule is not found, the system applies the default release rule defined in the ARun type.
X 1st from Sales Order; 2nd Determination, 3rd Default: The release rule defined in a sales order is given priority. If not found, the release rule determined by the release strategy is given second priority. If both release rules are not found, the system applies the default release rule entered in the ARun type.