Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

Infrastructure/Database/VisaApplications/Configuration/PastVisaConfiguration.cs

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+using Domains;
+using Domains.VisaApplicationDomain;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Infrastructure.Database.VisaApplications.Configuration;
+
+public static class PastVisaConfiguration<T> where T : class, IEntity
+{
+    public static void Configure(OwnedNavigationBuilder<T, PastVisa> entity)
+    {
+        entity.Property(p => p.Name)
+            .IsUnicode(false)
+            .HasMaxLength(ConfigurationConstraints.VisaNameLength);
+    }
+}

Infrastructure/Database/VisaApplications/Configuration/PastVisitConfiguration.cs

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+using Domains;
+using Domains.VisaApplicationDomain;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Infrastructure.Database.VisaApplications.Configuration;
+
+public static class PastVisitConfiguration<T> where T : class, IEntity
+{
+    public static void Configure(OwnedNavigationBuilder<T, PastVisit> entity)
+    {
+            entity.Property(pv => pv.DestinationCountry)
+                .IsUnicode(false)
+                .HasMaxLength(ConfigurationConstraints.CountryNameLength);
+        }
+}

Infrastructure/Database/VisaApplications/Configuration/PermissionToDestCountryConfiguration.cs

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+using Domains;
+using Domains.VisaApplicationDomain;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Infrastructure.Database.VisaApplications.Configuration;
+
+public static class PermissionToDestCountryConfiguration<T> where T : class, IEntity
+{
+    public static void Configure(OwnedNavigationBuilder<T, PermissionToDestCountry> entity)
+    {
+        entity.Property(p => p.Issuer)
+            .IsUnicode(false)
+            .HasMaxLength(ConfigurationConstraints.IssuerNameLength);
+    }
+}

Infrastructure/Database/VisaApplications/Configuration/ReentryPermitConfiguration.cs

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+using Domains;
+using Domains.VisaApplicationDomain;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Infrastructure.Database.VisaApplications.Configuration;
+
+public static class ReentryPermitConfiguration<T> where T : class, IEntity
+{
+    public static void Configure(OwnedNavigationBuilder<T, ReentryPermit> entity)
+    {
+        entity.Property(p => p.Number)
+            .IsUnicode(false)
+            .HasMaxLength(ConfigurationConstraints.ReentryPermitNumberLength);
+    }
+}

Infrastructure/Database/VisaApplications/Configuration/VisaApplicationConfiguration.cs

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+using Domains;
+using Domains.ApplicantDomain;
+using Domains.VisaApplicationDomain;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Infrastructure.Database.VisaApplications.Configuration;
+
+public class VisaApplicationConfiguration : IEntityTypeConfiguration<VisaApplication>
+{
+    public void Configure(EntityTypeBuilder<VisaApplication> entity)
+    {
+        entity.OwnsOne(va => va.ReentryPermit, ReentryPermitConfiguration<VisaApplication>.Configure);
+        entity.OwnsOne(va => va.PermissionToDestCountry, PermissionToDestCountryConfiguration<VisaApplication>.Configure);
+        entity.OwnsMany(va => va.PastVisits, PastVisitConfiguration<VisaApplication>.Configure);
+        entity.OwnsMany(va => va.PastVisas, PastVisaConfiguration<VisaApplication>.Configure);
+
+        entity.Property(va => va.DestinationCountry)
+            .IsUnicode(false)
+            .HasMaxLength(ConfigurationConstraints.CountryNameLength);
+
+        entity.HasOne<Applicant>()
+            .WithMany()
+            .HasForeignKey(va => va.ApplicantId)
+            .IsRequired();
+    }
+}