System could not determine composition for substance &1 of formula &2

What causes this issue?

You want to calculate the ingredients for an output substance in a
formula. Starting with the formula of the output substance, the system
performs an explosion over several levels and evaluates it
according to
the settings in the system. The composition for the output
substance is calculated using the composition of the (real) substances
that were found. The system determines the composition of the
substances found from Customizing for <LS>Formulas</> in the
<DS:TX.RMS_IMG_ENVPARA-COMP_STOP>FRML_COMP_STOP_SUBCAT</> (Generation of
the <LS>Composition</> view: substance types that cannot be exploded
any further) environment parameter.
The system could not determine the composition for substance &V1& of
formula &V2&.

System Response

Missing data is communicated to the application.

Error message extract from SAP system. Copyright SAP SE.