When you first access a database table via a mask, a new table is created to hold the value of the current id. if you save a record via the mask, the value in this table is incremented.
If you populate or add to the table using external means (phpmyadmin manual insert, CSV import or maybe website inserts) then this value is not incremented causing the P4A application to crash complaining the id_seq is out of sync.
Is there a built-in solution to this situation?
No there isn't. I brought this up years ago.
Somewhere in the forum is code to reset the sequence table when it gets out of synch.
you can use the p4a_db_source_resync_seq function here
but more easily use p4a function to get a new sequence number so you'd keep using the same sequence for all your inserts
otherwise look into P4A_AUTO_DB_SEQUENCES constant, it does what you need if you have autoincrements