For a RTRN_CAP in a GNMA, you need so sell some portion of the GNMA in order to produce the money that's being returned to you.Creating Placeholders is not a good idea, as that messes with the money's and share balances for that security foreverafter.
A RtrnCap should not adjust the number of shares in an account. A RtrnCap should only adjust cost basis of the held security and provide the difference as cash.I never allow Quicken to create placeholder transactions. Placeholders are share balance adjustments without cost basis used to reconcile with the balance obtained from the financial institution. Instead of placeholders, you should be entering appropriate transactions to enable Quicken to track the cost basis.Note: Some financial institutions do not provide the adjustments to share balance concurrent with transactions. In other words, you may only need to wait a few days for the dust to settle.
It is very probable that you paid a premium for your GNMA bond and those losses on the return of premium are tax-deductible capital losses. When you get a $1,000 in principal back from a bond you treat the result as the payoff of a $1,000 bond, and if you paid $1,050 for that bond you have a $50 loss. The result would be claimed as a long- or short-term capital loss, depending on how long you have owned the GNMA bond. If you did buy your GNMA at a discount, the price gain must be claimed as a capital gain.