Only Recording one Infocode on a Transaction in LS Retail

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I have an Infocode attached to certain items to collect the Salesperson details for these transactions, but it doesn't always record and I have just discovered that when they select the item - it is correctly requesting the salesperson information (first), but if staff then select the Pricechange button at the POS to change the price, the system is then only recording the Pricechange infocode information and the Salesperson infocode details are not being retained and recorded against the transaction.
How can I force the system to retain and record both sets of infocode information? One is compulsory - attached to the item, but the other is discretionary attached to a POS button. Even it there was some way to prioritise, the Salesperson information is more important - but ideally we want to capture both.
Thanks,