As the rent is calculated at the time of settlement, there will be no unit price for Sales-Based Rent(SBR) conditions as you know. As a result though distribution formula is assigned for SBR condition, there can be no distribution/transfer posting made for SBR conditions.
So to enable transfer postings to SBR conditon, I found a BAdI (BADI_RECD_DIST_RULE of enhancement spot BADI_RE_CD_CD) to implement by configuring a distribution formula with its Internal Formula as 'BAdI Distribution'. But prior going ahead with development, please let me know if there are any workarounds to address the same.
Thanks in advance !