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I'm in agreement with Stecal's underlying concepts even if I would word it in a different way 
Putting in the rear mirror the fact that you shouldn't be using RBS, increasing the size of RBS_04 will solve nothing, transaction will most likelly use a different RBS next time it executes.
Root cause of ORA-01555 is not the size of the RBS per-se but the inability of getting a consistent read. To minimize occurrence of this issue while you plan your exit from RBS try this...
1- Create a new, large RBS, call it RBS_BATCH
2- Assign offending transaction to RBS_BATCH
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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