ANSWER
According to Food (Labelling and Advertising) Regulations 2005 and Policy Guidelines for Fortification of Food In Sri Lanka, the Recommended Dietary Allowances (RDA) and Tolerable Upper Intake Levels (ULs) for Vitamin B are shown in Attachment I. However, there are no specific regulations on the RDA and Tolerable ULs for fiber in said Regulation.
Attachment-I-Recommended-Dietary-Allowances-RDA-and-Tolerable-Upper-Intake-Levels-ULs-
References
Minister of Health Sri Lanka. (2005). Food (Labelling and Advertising) Regulations 2005.
Ministry of Healthcare and Nutrition Sri Lanka. (2008). Policy Guidelines for Fortification of Food In Sri Lanka.