If any program would be somehow capable of converting .bp files to .src, it would be DataFlex from which both of these file types originate. Whenever this conversion is actually useful or even possible could not be reliably verified.
Convert DataFlex business process object to DataFlex/Multi-Edit source file.
We have found one software suitable in our database for this conversion.
Linux/Unix software - convert bp to src on Linux
A relational, 4GL Object Oriented database programming language
Convert from bp file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.