Pricing error: (Basic formula not allowed in this case)

What causes this issue?

A basic formula for <DS:DE.VFSCBF>scale base value</> or
<DS:DE.VFCTYF>condition basis</> was called up during
<GL:group_condition>group condition processing</>. As the items were
grouped for cumulation of the scale base value, multiple item groups
ended up with the same condition type. In this case, the basic formula
is not allowed.
This situation can occur when basic fomula '110 bulkiness (I)' is used,
for example.

How to fix this error?

In this situation, use a different basic formula
(<DS:TX.SD_TRA_FC_VFSCBF_111>'111 bulkiness (II)'</>, for example) to
carry out the calculation. See also the corresponding procedure notes
in the long text of the basic formula.

Error message extract from SAP system. Copyright SAP SE.