If 'making explicit' conveys this, then pro tanto it is a bad term. - How To Do Things With Words (1962) by JL Austin (OUP paperback edition, 69).
As an instalment, good enough as far as it goes, but not final; for what it is worth I heard Mr Parnell accept the Bill of 1886 as a measure that would close the differences between the two countries; but since then he stated that he had accepted it as a pro tanto measure It was a parliamentary bet, and he hoped to make future amendments on it - Mr Chamberlain's speech, April 10th, 1893 Pro Tempore (3 syl ) Temporarily; for the time being, till something is permanently settled Contracted into pro tem