In routing 3 types of sequences are available, which are standard, parellel and alternate sequence.
When you create the Routing then by default system creates the Standard Sequence.
Alternate sequences are linked to the standard sequence which is the main sequence. The place where alternate sequence starts from the standard sequence is called branch operation and again the place where it joins the standard sequence is called the return operation.
Alternate sequence consists of set of operations other than the standard sequence so that either of the sequences can be run for a production process.
Parellel sequences are set of operation which run parellel to the standard sequence, for example if you want more than 1 operations should be done simultaneously then use parrallel sequence.
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