Many thanks Irasmilo. Another observation please. Am I correct in assuming the General Partner of the LP should furnish the information for to arrive at the cost basis (income/expense items & cash contributions)?

No. It's your responsibility to keep this information. It's been reported to you on Schedule K-1 each year. That said, many LPs do keep and provide this information to their partners.

I certainly do not have this information. The safest route if the LP does not provide this information would then be to use the original cost of the LP units correct?

As stated above, you do have the information, or now know how to obtain it. (The LP may be able to provide copies of past K-1s.) Unfortunately, the original purchase price is no more right or wrong than any other number you might dream up.

Ira