Using option codes with decimal signs

I just found out that the statisticians want to use the option codes in http://www.ilo.org/public/english/bureau/stat/download/cpi/coicop.pdf for multi-select questions. However, these codes have decimal signs. For example, 01.1.4 for Milk, cheese and eggs. What are your recommendations?

Statisticians should not be bothered by codes. Codes are just a technicality, which is not even visible to anyone engaged in the survey. So, introduce your codes for the purpose of survey data collection, afterwards recode to COICOP codes if so desired for data processing.

For example, 01.1.4=>10001

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