Hello Kishore,
Below are the answers:
1. Stand alone scrambling is the scrambling which you use to scramble the data in a particular system and the scrambled data reside in the same system (no data transfer happens at all). You can use the scrambling while data transfer for BPL package and the steps for this are similar to scrambling in a time based reduction package.
2. As mentioned above steps for scrambling in BPL are similar to the ERP time based reduction package so there are no special rules to consider. Just keep in mind that for maximum consistency in case of BPL SAP always recommend to use the scrambling for those objects where pre-delivered scrambling content is available and no other data is shipped along with them. Basically how scrambling works in BPL is that, first data selection happens and data is stored in a cluster and then scrambling happens on the contents of the cluster before data transfer.
You may refer to how to guides for more information on scrambling in BPL:
https://websmp208.sap-ag.de/~sapidb/011000358700001109322011E/BPLV3.pdf
Hope it helps.
Cheers,
Anita
