How to fix field is not writeable error

Question

Hi I have written an Apex trigger to add the Opportunity owner name to Account team Member if the opportunity probability is equals to 50%.

However Iam getting errror called Field is not Writeable.

Please find the trigger code and error message below.

trigger addAccountTeam on Opportunity (before insert) {

List<AccountShare> acc_share = new List<AccountShare>();
List<AccountTeamMember> acc_Team = new List<AccountTeamMember>();

for(Opportunity opp: Trigger.New)
{
    if(opp.Probability == 50)
    {
        AccountTeamMember team = new AccountTeamMember();
        team.AccountId = opp.AccountId;
        team.UserId = opp.OwnerId;

        AccountShare share = new AccountShare();
        share.AccountId = opp.AccountId;
        share.AccountAccessLevel = 'Read/Write';
        share.OpportunityAccessLevel = 'Read Only';
        share.CaseAccessLevel = 'Read Only';
        acc_share.add(share);
        acc_Team.add(team);
    }
}
if(acc_Team != null)
{
    insert acc_Team;
}
if(acc_share != null && acc_share.size()>0)
{
    insert acc_share;
}

}

please find the error message

Answer 1

Two main problems exist here.

First, your org wide defaults are already full-open. You can't access AccountShare fields when they're set this way, because the system won't save them. Either don't create any AccountShare records, or reduce your access levels.

Second, if you decide to reduce your access levels so you can create AccountShare records, be advised that the legal values for the Access fields are "None", "Read", "Edit", and "All." You can't use the values that are displayed in the UI.

Finally, not a problem, but as a matter of optimization, please note that lists cannot magically become null, so the if-not-null checks at the end are not necessary:

insert acc_Team;
insert acc_share;