How to fill in the worksheet on Forex

Hi HMRC ADMIN, If I sell 60000 USD to buy 50000 GBP and then sell 50000 GBP to buy 62000 USD, how can I fill this information in the worksheet? Because I rather confuse which USD is the chargeable asset or GBP is the chargeable asset? If GBP is the chargeable asset, that means I just fill in the asset is 50000 GBP, cost of the asset is 60000 USD, and the disposal proceeds is 62000 USD, and make the gain on 2000 USD? Is it correct, if not, how to fill in the worksheet items on this kind of gain? Thanks in advance. A Wong

Hi
This is not an HMRC form and you will need to contact the supplier.

Hi HMRC ADMIN, This worksheet does not provided by the other supplier. When I online complete the self assessment form, in the part of the capital gain, there is a worksheet that I need to fill in the details about the gain/loss on the chargeable assets for every transaction, such as the description of asset, disposal proceeds, cost, gain or loss...etc. so I do not know how to fill in the details for the above transaction. 

Name removed admin .

Hi A Wong

You do not have to use the worksheet.  
Instead, you declare the total and add supporting evidence, such as a spreadsheet, showing how the gains/losses arise.  
This can be saved as a pdf file and attached at the end of the tax return.

Thank you